davidmorris1046 Posted November 14, 2013 Report Share Posted November 14, 2013 Changed all 3 ignition coils, Runs great but the idle is wild. 2-3K Service manual says download quick learn from Tech 1 tool. Any other ideas? Idle returns to normal after a while 10-20mins. Thanks Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted November 14, 2013 Report Share Posted November 14, 2013 bad intake manifold gaskets or a big vacuum leak Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted November 14, 2013 Report Share Posted November 14, 2013 Unplug your idle air control valve, and see if it changes. The IAC died on my Lumina Euro 3.4, and resulted in it bouncing off the 4k RPM fuel cutoff. I eventually got mine home, swapped the IAC off of an old 3100 intake, and that fixed the problem. Quote Link to comment Share on other sites More sharing options...
ILoveSun Posted November 15, 2013 Report Share Posted November 15, 2013 bad intake manifold gaskets or a big vacuum leak EXACTLY! Had same issue - idles like crap but ran fine. Turned out to be lower intake manifold gasket leak along with bad vacuum manifold lines. Idles and runs like a new car now! Greg Quote Link to comment Share on other sites More sharing options...
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