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1990 Chevrolet C K1500 W/T Ext Cab

1990 Chevrolet C K1500
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February 28, 2011, 5:30 pm

AutomotiveForums M
 

Question: 89 350 tbi idles rough stalls out?

truck idles poor and surges in park and at idle under load, once up to cruising speed it runs better. I have changed IAC, TPS, ESC, EGR, installed a rebuilt injector pod with injectors, fuel pump, fuel filter, distributor, o2 sensor, Knock sensor, intake gaskets, cleaned tbi unit and replaced base gasket, cleaned & cofirmed good ecm grounds, none of these did much help. I ended up changing the ecm with a reman and it ran awsome for about two days then the problem came back. something burning up the ecm?? any help would be great.


March 2, 2011, 8:17 pm

Tyler O
Expert Mechanic

Are you 100% sure all the vacuum lines are hooked up properly and that you have no vacuum/air leaks?

Any check engine light codes?

Have you checked fuel pressure?


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March 3, 2011, 1:19 pm

AutomotiveForums M
 

yes, vacume lines are correct, I disconnected each line one at a timeand found no change, including the brahe booster line. last time I checked it had a lean exhaust code which it has had before but still ran good. the exhaust is 3" with a dynomax muffler, no cat, stock y pipe & manifolds, this setup has been on for about 3 yrs.


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