Question about 1999 Pontiac Grand Am GT

2 Answers

Rough idle at stops

I have a 99 pontiac grand am and it has a stutter going up hills and now a real rough idle at red lights what could cause this

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  • pokey_tubbs Oct 12, 2008

    the rough idleing has kinda smoothed out but when you are giving it gas its as if it just cant go ..... around 4000 it just wines as if it cant go any faster .....and theres a really loud whistleing sound now also

    2002 Grand Am GT 3.4

    thanks !

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2 Answers

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  • 231 Answers

It could be any of the following:
time for a complete tune up ( plugs, wires, cap, rotor )
it could be thatyour ignition timing is out
you mayhave a clogged fuel filter
your injectors may be dirty
or you may have a vacuum leak
any of these could be the cause for your problem.

Posted on Oct 12, 2008

Sounds like a vaccum leak to me. check all your vaccum lines. thats where i would start.

Posted on Oct 19, 2008

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