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Heavy hesitation, and stumble under load. Idles fine, brake torque and stumbles and hesitates, stumbles while driving.

Has new TPS, new cap, rotor, and O2 sensor is ok, catalytic convertor is new. Fuel pressure at idle is 40psi, injectors test good. No check engine lamp on. Cannot drive anymore, hesitates so much will not pull itself. But will idle fine out of gear.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

tripletauto
  • 1450 Answers

SOURCE: 2000 Ford F450 with V10

have you cleaned the throttle plate? this is done by removing air intake hose and spraying out with cleaner and wiping it down open throttle and wipe off the butterfly and bore. this will usually cure a stumble.

Posted on Aug 20, 2008

  • 160 Answers

SOURCE: truck stumbles just off idle

may need to have a fuel injection service,but when i worked at chevrolet i believe those year trucks were having a problem with the throttle body sticking

Posted on Nov 14, 2008

  • 1 Answer

SOURCE: Car stumbles,hesitates,loses power on Hwy, randomly

Did you check earth connection of electric system?

Posted on May 10, 2009

  • 1 Answer

SOURCE: 1994 gmc seirra k1500 4.3 engine 4x4 hesitation

Possible erratic signal from the crank sensor

Posted on Jul 31, 2010

dttech
  • 4803 Answers

SOURCE: 4.3 CHEVY IDLES OK IN PARK BUT UNDER LOAD WANTS TO STALL , HESITATES WHEN TAKING OFF, AND FEELS LIKE THE BRAKE IS ON WHEN DRIVING CHANGED DISTRIBUTOR, WIRES, PLUGS, AND CONVERTER IS FINE AND FUEL PRES

So what codes are you getting from the engine computer?

Posted on Mar 24, 2012

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1 Answer

Hello I have a 94 GMC s15 Jimmy it sputters on take off then at fiftymph it snaps back to life very bad smell of gas out of exhaust replaced plugs cap rotor fuel pressure regulator tempsens tps spider


Try changing the EGR valve. If the EGR valve sticks open you will get hesitation and stumble/stall along with extremely rich fuel mixture.

Mar 09, 2016 | GMC Cars & Trucks

1 Answer

Engine stumbles only in no load circumstances. Idles smoothly, and stumbles only in no


no miles stated, 400k miles> or 100 = 100k?
if any 95 has 100k miles that be like a new car. no ?
5k /year, wow...
trouble is i cant drive car. and see this effect.

the issue is acceleration, right? :called Hesitations !
and only happens on a hot engine , yes?
and never happens wide open throttle.? correct?
HAPPENS:
only when tipping in the throttle at cruise. (then self corrects )
THE TPS sensors does that.
The TPS is a demand sensor. it sees driver DEMAND
acceleration, and this is detected and the PCM goes to ENRICH mode. this is done or the engine goes LEAN until the MAP BARO READINGS, catch up and correct fueling.
that is my wild useless guess. (not driven and me not scanning the PCM while it fails.)

The TPS is a rate of change sensor.
This is because all air meters made are slow.
The TPS hides this fact. until bad.
there are other causes,but im not there with my scan tool..
and (box of gauges)

Aug 29, 2015 | 1995 Jeep Grand Cherokee

1 Answer

The car starts fine when i first turn it on. After driving a lil while the car warms up and i stop somewhere,the store or where ever, turn it off. i come back a couple mins later and it takes a good 3+...


There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine
Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of
spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your
scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Good luck and rate this.

Mar 08, 2010 | 1997 Volkswagen GTI

1 Answer

The car is stumbling and hesitating While the engine hot is


Take it to a mechanic and have the cooling system checked, could be a bad coolant sensor.

Feb 10, 2010 | 1995 Nissan Quest

2 Answers

95 gm 5.7 stumbles bad at low rpm


have you tried to spay the base of throttle body & intake to see if throttle body base gasket is is good or sucking air

Feb 01, 2010 | 1995 Chevrolet C1500

1 Answer

DAEWOO LEGANZA P0303


A P0303 code means that the the car's computer
has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.
Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
A code P0303 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors
.


Jan 23, 2009 | 2002 Daewoo Leganza

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