Thread: Engine surging and dieing

99 grand prix gt. 3800, engine surges and tac pulsates +/- a couple hundred rpms. Some times it will do it while setting idle and sometimes it will surge while under acceleration. some times when stopped at a red light it will surge and die. It will restart and if you keep a little throttle it will stay running. If it sits for a while, it will start fine and run fine untill the next episode, which may be a while.

I was having the crank position sensor symptoms, and have changed the sensor a few weeks ago for the second time in four years. after the sensor change it ran fine untill a couple days ago, when it started this problem. There are no check engine lights or stored codes. Any sugestions would be greatly appreciated.

Ok so after not really trusting what my wife was explaining about the problem with the car, I drove the car for about 20 miles, with street driving and interstate driving and it ran fine, with no isues.
A couple of days later we took the car out for dinner. Just driving down the street, a couple blocks, under normal accelleration, i could feel the car surging a little, and the tac bouncing a couple hundred rpm. Got on the interstate and accelerated to speed, about 65 mph cruising and when you accelerate a litle to around 2500 rpm the car would start surging and tac bouncing a couple hundred rpm. If you let off to under 2500 the ca would quit surging.
After dinner, just driving down the street at about 35-40, the car just died, but fired right back up. There was no engine light displayed.
Now my wife claims that even driving down the interstate, some times the car will just die, but will start right back up.
Yesterday She was driving and it and it died while moving, and the check engine light finnaly came on. When I checked it there were 4 codes in the system, P0171, PO327, P0336 and P0716. Now I am not sure if the crank position sensor code was allready in there, becouse there were no engine light on, when i changed the cps and I did not check for stored codes. The CPS is only a couple of weeks old. and what the car is doing now is not the same as before the CPS change. Any Ideas?.....

Ok so I cleaned the MAF sensor with some electronic cleaner. It really dint look dirty, but did it any way. I checked for vac leaks and did not find any. Any other ideas?

i had similar issues with my car surging and dying and it turned out to be there fuel pressure regulator.

not sure if this will help but my 2001 grand prix did this and it ended up being the spark plug wires. but mine was a little more excessive then just a few hundred rpms. so i switch out all my coil packs and all new plugs and all new wires and the problem was fixed. i would be accelerating and out of no where it would basically die out but never to the point of full stall. it would always stay running just acted stupid. they told me it was probably a short somewhere in the spark wires, cut wire or something but never found.