Question about Chevrolet 1500

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1991 chevy extended cab 1500 with a 350 it will idle down low the die then it will idle high run ok for a while always changing

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Possible deposit buildup in the throttle body and specifically the IAC (idle air control chambers).This causes disturbance and your systems ability to control air/fuel mixtures at near idle conditions .Perform service, recomending removal of the IAC valve and cleaning with an O2 safe injection cleaner.3M makes a very good line of products including 3M"do it yourself" fuel system tune up pn#8963.Also verify proper EGR operation and no sticky valve or build up there.....good luck

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

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Engine starts , and dies. Only when weather is cold.


hello there
I looks like your oxygen sensor,Try to disconnect and then see what the car does?Let me know.You may need to adjust the fuel mixure,seem it is running a little rich that is why the car in idle goes up and down.
proporsche@yahoo.com

proporsche

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