Question about 1994 Chevrolet S-10

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94 s10 4x4 4.3L TBI. rough idle and power loss

Idle is erratic at times and nearly dies, when revved up while idle is erratic, it takes 5-7 seconds to return to idle, otherwise it returns normally. when driving you can press the accelerator and after about 1/4 throttle it seems to lose power until you depress the accelerator. there is also a miss but is only noticeable when idling. i have already replaced the throttle position sensor, plugs, wires, and vacuum lines. also this problem is random and is becoming more frequent and with worse effects. it occur when cold and after driving.

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  • chrisrickett
    chrisrickett Jan 13, 2013

    On the issue of power loss, it happens when accelerating but also has issue with maintaining speed, when pushed to full throttle the truck downshifts and accelerates rapidly. Im not sure its full power but is more than capable of driving up hills and pulling

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  • Chevrolet Master
  • 450 Answers

IAC valve @ throttle body regulates the air/fuel idle. its right in front of the throttlebody, replace it, MAP sensor works together with IAC, both could be your problem. everything else you did is good, I feel these items are necessary to put you back in bussiness, just do it !!!

Posted on Jan 13, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 11163 Answers

SOURCE: Shakes while idling and sometimes stalls.

check for minor vacuum leak and map sensor,pcv,egr valve

Posted on Oct 13, 2009

  • 38 Answers

SOURCE: 1989 Chevrolet C1500 with 5.7L V-8. Engine dies

fuel pump is working but when accelerating it doesnt pump enough fuel up to the engine then it will fall on its face if it is a electric pump you may have to drop the tank if it is inside and replace it if it is on the engine replace it thats what is exactly wrong with it

Posted on Jul 31, 2009

Mustgo
  • 2359 Answers

SOURCE: 91 S10 rough idle, stalling ALDL problems

Make sure there is no vacuum leaks.


Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the RPM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

Posted on Dec 17, 2009

  • 1244 Answers

SOURCE: rough idle, power loss while driving

check /replace the fuel filter and check the fuel pump pressure before and after the bleed valve to the throttle injectors

Posted on Jan 20, 2010

  • 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

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Go through the related help links with similar problem,it may help:---
Click the links below:---
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