Question about 1999 Chevrolet Silverado 1500

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1999 Chevrolet Silverado, 5.3, 1500, 148K Miles. Problem when cold it has a miss under a load, but it will idle good. After warmed up no problem. After checking for a vacuum leak we replaced the following: EGR Valve, Plugs, Wires, and idle air valve all AC parts

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  • David Smith
    David Smith Oct 22, 2013

    David Smith

  • David Smith
    David Smith Oct 22, 2013

    I forgot in the past 3 months we also replaced the fuel pump, filter , and regulator. All AC parts

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  • Master
  • 364 Answers

Sounds to me like your automatic choke is disrupting the mas sensor sending wrong signals to the computer, take of the mas air flow and clean it, wouldnt hurt to do the map sensor as well. clean out the choke body and see if that helps, good luck. I prefer NGK plugs for high and hard revs.

Posted on Oct 22, 2013

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  • Expert
  • 67 Answers

This is just a stab in the dark, have you checked the hydraulic lifters? I had a similar symptom on a 4 cylinder engine and it turn out to be a stuck valve lifter.

Posted on Oct 22, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

txkjun
  • 409 Answers

SOURCE: 2000 silverado 4.8 v8 runs bad when it is cold out side.

Try replacing the coolant temperature sensor for the injection system.

Posted on Jan 11, 2009

wyotechgrad
  • 30 Answers

SOURCE: I have a 96 cavalier z24. when I start it up the

See if there is a code in the computer and work from there. Find someone with an OBD2 code reader. If I'm not mistaken an OBD2 code reader works on 1996 and newer models. Could be a bad coil and you don't notice it when you first start it until it idles down, to check for that, while the engine is running, pull each wire off the spark plug, Each time you do that you should hear the engine struggle. Then pick back up once you plug it back to the spark plug. If you pull one and nothing happens to the engine, that could be all or part of the problem. Hope this helps.

Posted on Nov 24, 2009

  • 11 Answers

SOURCE: I have a chevy silverado - 5.7 engine. It runs

Fuel Pressure/Pump?
Injectors?
Fuel Pressure Regulator?
Are there any codes/check engine light?
Ignition coil?
Just off the top of my head.

Posted on Mar 11, 2010

flbergeron68
  • 541 Answers

SOURCE: 98 silverado 5.7l no power when under load

no codes ? it happens, guess we'll go the old fashion way then. you are going to have to test every sensor like throttle position, idle mixture, mass air flow etc. and replace the ones that are defective. does it smell like gas coming from the exhaust ? this could be the choke being stuck, also controlled by computer that controls everything from the info it gets from the sensors.

Posted on Jul 06, 2010

  • 99 Answers

SOURCE: 2000 chevorlet silverado 2500 w

Sounds like a ruptured diaphram in the fuel pressure regulator. Fuel is being sucked into the motor through the vacuum line. remove vacuum line off regulator and see if there is fuel, or odor of fuel in the line , if so , the regulator is bad. Good Luck

Posted on Jan 14, 2011

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Have you checked the fuel pressure regulator to see if its leaking?

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Normally the first thing that would cause a miss like that (under load in a tall gear) is a secondary ignition miss, usually caused by a plug wire, or possibly a distributor cap or rotor-have these been replaced in the last 30,000 miles? If not, I would do them first. If it still happens, you might then change the fuel filter, clean the throttle body and Mass Air Flow sensor, and replace the air filter-that's a complete tuneup, it should last you another 50,000 plus miles as long as you change the oil religiously and don't overheat it.

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i have seen o2 sensors do exacially what you are describing, you have the 5.3l right? i also have seen fuel pressuer regulators do that, and coolant temp sensor.

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