99 v6 3.4 Grand Am hesitation problem

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Zane99

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i have a 99 Pontiac Grand Am. the car bucks, hesitates or misfires at idle speed and at 55-62 mph, Those are the only two times that this happens. the computer will not throw any codes and i have replaced the spark plugs, wires, coils, igintion modules. still the same thing. when you step on the gas the car runs like a champ. now issues what so ever. I'm thinking maybe a fuel problem but as stated the car runs perfectly fine except for these two times. Any help would be greatly appreciated. Thanks:confused:
 
Use good quality spark plugs for sure. Also, finish your tune up. Check the fuel pressure at the rail; replace fuel filter. Once you're done, I would be guessing partial failure of a sensor.

Also, you stated is happened twice; I am assuming it happened then you replace the above items and it happened again once.
 
Yes, i used average plugs and wires as i am going to sell the car. Just dont want to sell it in this condition. yes it happens whenever i drive it but only in idle and between 55-62 mph. maybe this is because the rpms are lower at those speeds. Havent checked fuel pressure yet. could it be a fuel regulator that effects it at low rpms. anyother time the car runs strong and perfect.
 
fuel filter has also been replaced as well.
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Hesitation=?

replece the TPS= throttle position sensor & adjust properly!! when they go bad - you will get this problem -has a bas worn spot in it from use .
 
TPS? I havent tried that one yet. are those hard to replace and adjust?
 
Has anyone ever thought about the transmission torque converter solenoid? Just thinking it could probably be a factor here.
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I suppose it is possible but when I see those go, they are super minor (like hapening twice) then they get bad... fast. Might even get to the point when you initially press the gas pedal then release the pedal and go to press it again the transmission is not engaged. We'll see if its even being driven atm.
 
Or if the actual TCC solenoid is not at fault, it could be the TPS or temp sensor that are responsible for engaging/disengaging the TCC lockup system that the driver may mistake the pulsations for hesitations and I'll even go out on a limb here and mention a bad brake pedal switch.
 
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