March 17, 200521 yr I just finished putting in an '85 XT MPFI Engine into my '88 GL WGN (spfi - engine died). The problem I'm having is with the idle after warm up. When I start the engine cold, it goes to high idle just fine and runs smooth. But when it warms up it will intermittently "flutter" and drops rpm, then tries to recover; and when I try to rev it a little it will "flutter" until the rpm get way up. Do I have a vacuum problem or a sensor issue? Help!
March 17, 200521 yr it could be vacuum or it could also be the idle air control valve, its the gizmo on top of the thermostat
March 17, 200521 yr Author Thanks for the response, I'll check it out tomorrow. -Mike it could be the MAF too
March 17, 200521 yr could be any of the suggested... MAF or vacuum leak (not mutually exclusive either) would be my guess. Try pulling codes and see what you get.
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