My grand prix has been in the shop numerous times for this problem and the mechanics can't seem to figure it out. The car sputters when accelerating and/or going uphill. Spark plugs were changed, fuel pump and filter changed and the converter was cleaned out. Do you think the converter should have been changed all together? i have been getting all kinds of tips from "backyard mechanics" but no dice! what do you suggest?
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You can't use those two words in the same sentence when talking about transmissions. Best is new (rarely done) next is a rebuild (most times if from a good reliable shop, good but not cheap) then there is the used unit from a scrapyard..cheaper than either, but if it doesn't work, you get to pay r&r as many times as it takes, even if the yard guarantees it. (only way I'd do that is if I owned another identical car that I had driven and knew for sure the unit was good.
I have the same car and i had the same problems
I did the same stuffs you did to try and figure it out
The answer, my friend is
REPLACE THE CATALYTIC CONVERTER
My mechanic replaced the catalytic converter and WOW, it runs like a brand new car
The car was getting dangerous to drive and now you touch the gas pedal and it goes
These lights are on because the system has a fault and it has disabled itself, so you have no anti-lock brakes or traction control right now, you will have to have the system tested for trouble codes by a shop with the proper test equipment, a GM dealer is your best bet.