1991 s15 jimmy, and sometimes it runs rough sometimes
I have a 1991 s15 jimmy, and sometimes it runs like it's showroom new and sometimes it runs like i'm trying to burn water, the problem happens when it's summer or winter, i replaced feul pump, filter, and tank, plugs, wires, cap and rotor. what gives?
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sounds like it could be a problem in the IAC circuit. The Idle Air Control valve manages how much air gets into the engine while @ idle. It receives commands from the ECM based on inputs from at least the mass air flow, coolant temp, throttle position and oxygen sensors