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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Rough idle, only when in gear.

  • K9MrJim
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2 years 10 months ago #58913 by K9MrJim
Rough idle, only when in gear. was created by K9MrJim
1993 Chevrolet K1500 350tbi. Truck shakes when stopped at traffic lights. Shift into park or neutral truck runs smooth. No DTC's. No other noticeable problems running. I don't have any scanners or scopes. Any suggestions welcome.
Thanks for your time l

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  • juergen.scholl
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2 years 10 months ago #58917 by juergen.scholl
Replied by juergen.scholl on topic Rough idle, only when in gear.
Motor mounts, pinched wires....
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.

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2 years 10 months ago #58961 by Paul P.
Replied by Paul P. on topic Rough idle, only when in gear.
There is a little silver welch plug on your TBI unit adjacent the throttle linkage and TV cable.

It's the stop screw that adjusts the minimum airflow to the TBI unit.

You could try and attach a feeler guage to act as a shim too, to see if the problem corrects itself before you drill.

Drill it out, there's a T10 torx screw behind the plug, give it 1/2 to a 1/2 turn clockwise.

Problem solved?
Never stop Learning.

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