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1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

1990 k1500 backfire

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Old June 8th, 2018, 8:05 AM
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Default 1990 k1500 backfire

I have a 1990 Silverado K1500 with a V8 350. At first start it ruff idles and and runs ruff through acceleration backfiring occasionally but after driving down the road for 5 to 10 minutes it starts running fine with no issues until, for example, I leave work to go home then it’s the same thing. Any help would be appreciated thank you.
Old June 8th, 2018, 8:15 AM
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Originally Posted by Cjk13
I have a 1990 Silverado K1500 with a V8 350. At first start it ruff idles and and runs ruff through acceleration backfiring occasionally but after driving down the road for 5 to 10 minutes it starts running fine with no issues until, for example, I leave work to go home then it’s the same thing. Any help would be appreciated thank you.
Probably a TBI fuel injection issue would be my guess. Very easy to swap in new ones, assuming that that is the issue. Its an old pickup after all and pre-OBD II.




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