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1997 PONTIAC GRAND AM 3100. variation of idle speed, Up to 1500rpm, down to around 300rpm then back to 1500rpm, then idle fine

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Could be a (tps)throttle position sensor also look at (maf)mass airflow sensor/(map)manifold absolute pressure sensor.(iac)idle air control valve...or and a bigger fix a leaking intake manifold gasket but will usually stall when stoping or idleing down.hope this helps so many possibilities but i hope this helps.please rate my answer,and thankyou for using fix ya.

Posted on Apr 02, 2011


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My 1997 grand prix idiles high when you start it stays at 2to 3 grand on r.p.m

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