Question about 2002 Pontiac Sunfire
High idle sometimes it idles high then low sorta pulsing.
somtimes if I turn the heater to defrost it idle up to 4000 rpm but as soon as I take it off defrost it goes back down
replaced the computer 1 year ago
engine codes p1133 p0171 p0507 p0131 all at once
Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Posted on Mar 10, 2009
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Posted on Jan 02, 2017
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