Question about 1999 Pontiac Grand Am GT

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Is it ok to drive the car with a vacuum leak? and could this be why my car has been hesitating when I give it fuel sometimes?

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No not really you feul milage will **** and the car will hesitate not good to **** to much air will make your car run real lean bad news for your cylinders good luck

Posted on Oct 03, 2009

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Yes it is a source of the hesitation and no u really shouldnt drive it as it can create a larger engine problem in the long run.

Posted on Oct 03, 2009

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Sounds like a vacuum leak in the motor. Backfiring may be its own problem altogether. Backfiring only occurs when cold air is being introduced into a hot exhaust stream or when the timing is off. Check for vacuum leaks under the hood and leaks in your exhaust. If you have a leak in your exhaust it could be interfearing with your emission sensors and giving your motor false information.

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Hard starting but after started runs fine sometimes hesitation in the throttle but just replaced fuel pump assembly 6 mo. ago. Any ideas?


maybe a complete tune up will do the trick especially if you havent had one in a while. if your tuneup is ok check for vacuum leaks or air blockages like in the air filter these would give you symtoms like what youre having.

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You should add a rs4 performance chip or the fuel economy chip also made by rs4. there like 70 bucks. If the problem is electrical changing your chip could solve the problem. Even if is doesnt work the chip will make your truck idle more smoothly, have better throttle response, and you will add 3-7 mpg. I bought one for my 1997 jeep grand cherokee straight six, and it felt like i was driving a different truck . It mae that much of a difference...you cant loose!!!Like everyone says , it could be a vac leak or a clogged fuel filter , soetimes bad gas...your problem is a needle in haystack. Try the chip...I hope this helps

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2 Answers

Car hesitates on idle


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1 Answer

Hesitation problem when accelerating. Quad 4 has hesitation espcialy when first taking off. New fuel pump, coil packs, fuel filter, throttle pos sensor converter.


Check for vacuum leaks, make sure your PVC valve is operationa. Also be sure to take your car to a place such as autozone where they can do a detailed diagnostic test (usually free of charge) wich will help you further locate the problem..

PCV Valve usualy runs about 3 - 7 dollars, and is usually located on your valve cover attacthed to a vacuum line,

O2, and Fuel sensors may sometimes have adverse effects on engine performance.

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