Question about Chevrolet G20

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1993 chevy van, G20 350-TBI injection. Stalled at a traffic light, thought I was out of gas, but was not. Started back up, soon as It dropped in gear, it died again, starts right back up, have to pump the accelerator constantly once in gear to get it home, could not go over 25mph or into high gear, it would die. Got it home, it starts right up, but once you put in gear with any type of load, it dies. I just changed the air idle valve on the Throttle body, fiqured that was the cause but did not help. I thought of the fuel pump, but my exp. with fuel pumps, when they go out, they go out, thats it, the engine will not start. This is not the case, it will start right up, idle fine, I can see gas squirting out of the injectors. But once you try to drive it, It will studder and shudder like its running out of fuel unless you pump the gas pedal, it will clear up for a split secend then act like its going to die, I don't have a way of checking the fuel pressure, so any advice on what to change?? I'm mech. inclined (machinist) and do most of my repairs, I don't have a scanner, but there is not a check engine light present. Please help! Need to use this van!

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  • Cindy Mccrary
    Cindy Mccrary May 20, 2016

    Did u ever figure out what the problem was?I'm wondering I'm having the same problem I've got a 3/4 ton Chevy customized conversion van it has a 350 TBI engine .I've almost replaced everything brand new trying to figure it out



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  • Chevrolet Master
  • 76,164 Answers

Have you scanned for fault codes? How about the Throttle position sensor, have you tested it?

Posted on May 20, 2016


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Posted on Jan 02, 2017

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SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

  • 158 Answers

SOURCE: Car starts then dies

Check Fuel Pump

Posted on May 14, 2009

  • 1 Answer

SOURCE: RX7 with 13b engine is hard to start, idles fine, dies on accel.

problem like this on garden tractor ,was weak coil ,-when engine at low manifold pressure[idle] spark could jump gap and fire cylinder ,higher pressure /under load-wouldn't fire...check color of spark -orange,yellow ,white spark=weak, blue spark is stronge,

Posted on May 14, 2009

  • 2007 Answers

SOURCE: Engine starts then dies

Probably MAF. Mass air flow sensor, or idle control system/ sensor.
I have actually heard of some people having this problem because of a faulty heat sending unit, which doesn't show up on scan, but i'm still betting on the MAF. Good luck, let me know what you find.

Posted on Jun 22, 2009

  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

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