engine stall with rough idle, 50mph wtf

[jrobie79]

1993 3.3L v-6, always has the roughest idle, the rpms bounce all over the place, they die down like the engine will stall then immediately recover and really rev the engine, will happen a couple times before a complete stall, and restart, then stalls again, takes a lot of gas to get it going again. i was thinking maybe spark plugs or wires, or maybe a vacuum line leak somwhere? any suggestions.

also have a problem at around 40-50 mph the car just goes absolutely nuts, and stutters like crazy like the engine stopped working until i hit the gas and the car rocks till i get over 50 which it works fine, had it goin up to 90+ mph without a problem till i hit the 40-50 mph mark again, is this related to the stall problem? please help i have to take this car to school and cant afford to get a new one to get me there.

 

[Unregistered]

get it to your local parts store and see if they can run a diagnostic on it. I have a 1997 grand am and had a similar problem-ended up being the crank shaft positioning sensor-cost about $25 to fix it you self.

 

[michele]

get it to your local parts store and see if they can run a diagnostic on it. I have a 1997 grand am and had a similar problem-ended up being the crank shaft positioning sensor-cost about $25 to fix it you self.

I seem to run into the crankshaft sensor problem myself with a "96" can anyone tell me where i would find it on the engine

 

[Pyre]

on a buick 3.3 / 3300 you would locate it behind the harmonic balancer. It requires a special tool to remove the harmonic balancer.Takes 1-1 1/2 hours in shop. cost me around 125 dollars on a 3.3 in a 92 buick for the part and labor. Part was about 45 dollars and a little over an hour of shop labor.

I would guess it should be similar on any other 3.3 gm motor. Not sure on any of the other motors where it is.