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I've got a 1994 GMC Jimmy 4.3 vortec v6. The truck

I've got a 1994 GMC Jimmy 4.3 vortec v6. The truck starts fine. It idles rough, and would occasionally die, at a red light for example. I replaced the fuel pump, plugs and wires, and the ERG valve, as it was throwing a code for it. Now when accelerating it stalls and hiccups, especially when going up hill slowly. At first if I opened up the throttle, like driving 70 on the freeway, I could drive it, but now it's much worse. I don't even think I can get it out of my neighborhood.

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  • 67 Answers

You may also want to check inline fuel filters they may need replacing

Posted on May 06, 2013

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Posted on Jan 02, 2017

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SOURCE: Starts fine, Idles fine, Drives Fine for a while

you might want to chk. the crank sensor and or cam sensor. sounds more to me that it could be fuel problem. chk. fuel pressure. pump could be on its way out. don't be fooled by hearing the pump running as they sound like they are pumping but there not, at least not enought pressure to keep it running. pressure should be around 50 p.s.i.

Posted on Jan 06, 2009

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SOURCE: 1994 GMC Jimmy hard to start and runs rough when first started

did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.

Posted on Feb 02, 2009

wracefans24
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SOURCE: 1994 GMC Jimmy engine runs rough when cold; smooths out when warm

you need to have the codes checked to know what direction to start repairs,Autozone does this for free

Posted on Jan 20, 2010

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I have a 1994 GMC Jimmy 4.3 vortec 4x4 automatic, and the transmission started to slip, then the battery died, we got it home and it wouldn't start, so we charged the battery and it ran fine for abou


You may potentially have an serious electrical drain in your car circuits. The drain is slow and continuous, draining your battery charge even if you do a start. Check the cabling and look for load on your battery with a Volt meter to check for any charge drainage. Check this as a precaution before replacing any more parts.

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Re: vacuum_lines


This was all I could find. I hope this helps and good luck.

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I have a 4WD 1998 GMC Jimmy 4.3L Vortec V6 and it started running hot then it shut off and wouldn't start back up... do you think there would be any way to fix without replacing the whole engine


IS THEIR WATER IN THE OIL? CHECK THE PLUGS TO SEE IF THEIR WET.YOU MIGHT PUT SOME PLUGS IN IT IF WET TO SEE IF IT WILL RUN.THEN PUT SOME HEADGASKETS ON IT.BUT IN REALITY NEW MOTOR WOULD BE BEST.

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1994 GMC Jimmy engine runs rough when cold; smooths out when warm


you need to have the codes checked to know what direction to start repairs,Autozone does this for free

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I got a 1994 gmc s15 jimmy with the vortec 4.3 it idles rough but whaen i drive it give it gas it runs great what would cause that.


sounds like it could be a problem in the IAC circuit. The Idle Air Control valve manages how much air gets into the engine while @ idle. It receives commands from the ECM based on inputs from at least the mass air flow, coolant temp, throttle position and oxygen sensors

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try idle speed control motor/throttlebody posistion sensor.

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