Question about 1994 Pontiac Grand Prix

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Seems to miss at highway cruising speed

3.1 liter - I have run injector cleaner through it and have tried running a full tank of mid-grade gas. At highway speed (100-110 KPH) in Drive and 3rd there is a repeated hesitation - RPMs about 2000. If I accelerate, it downshifts smoothly and does not hesitate again until I idle down and sit again around 2000 RPM

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  • Anonymous Mar 19, 2014

    rough idle and eng dies

  • Anonymous Mar 23, 2014

    When warm idle goes up and down on its own, revving takes it up and it stays there for more than 10 seconds then drops...while driving at any speed when i take my foot off the gas it jerks a bit, then when i accelerate it jerks again, otherwise it is smooth

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  • 21 Answers

Try changing your fuel filter

Posted on Nov 23, 2008

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If I'm understanding you correctly, you believe you got contaminated gas from a station where they had recent work done on their tanks. If that's so, Now that you've run most of the gas out I would start by changing the fuel filter then fill the tank with good gas (I might even go up on grade for this tank). Although it's unlikely you may have gotten a fair amount of dirt or water, you may want to try adding some dry gas in case there is still water in the bottom of your tank.
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Dear anew32, Wed 2-11-2009 3:43am EST (USA)

Do you often run your gas tank to near empty?
If so.......
This sounds like it may be as simple as cleaning the water or gunk out of the gas tank which is what I always do 1st because it's easy and inexpensive.
If your fuel is contaminated with gunk, grime, water and/or bottom junk like rust this will cause stalling and rough riding!
Try spraying a can of starter fluid in the air intake and see if it runs! If it does, it's most likely bad fuel or clogged injectors so....
Fill the tank with High Test, Add some dry gas and a good fuel system cleaner or 2 or 3 and this should dissolve all the gunk and clean the injectors! Read & follow the cans' instruction carefully.
If this cures the problem never let your gas tank get below 1/4 and especially never run it to empty as this is when the gunk and/or water will enter the system!
Hope this helps!
Good Luck!
jack
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You may have gotten some bad gas.  This gas could have been contaminated with water from condensation in the gas stations tanks, or just from being old.  I would purchase some HEET brand water remover or SeaFoam fuel additive.  SeaFoam will seperate water and clean your injectors.  Both are very good products.  Also a cheeper remedy is that if you believe it is water, then I would try pouring some rubbing alcohol (like in the medicine cabinet) in the gas tank.  An ounce or two won't hurt and it will help seperate the water and allow you to drive your car.
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