Thread: Evap leak and surging in 4th

Originally Posted by BillBoost37

When you say ... you've tried premium mobil fuel. Does that mean that you typically don't run Mobil or don't run premium?

If you answer that you don't run premium, the issue is between the seat and steering wheel. Likely you hurt the motor.
If no to the above, then change the plugs and wires. You are probably running some crappy plugs like Bosch platinums that get destroyed in our waste spark environment.

I'm changing your title... Cause you don't need a mechanic to solve this one. Likely it's straight forward enough thatmy 17 year old neighbor could solve it in ...HER sleep.

Completely disrespects and belittles new member...

Originally Posted by vtechkiller

will do ill run the codes next time I'm at autozone

Bends over and takes it.

OP the bouncing as said before could be the TCC and/or solenoid. If the car is under warranty get it in there ASAP...
You can look for the Evap leak by following the lines around the engine bay. The Evap canister is bolted to the same plate the MAP sensor is on, and is connected by a red plug.

Hi sorry for revisiting this but my 2000 GTP is doing exactly the same as described in the original thread. Surges/bucks soon as it shifts into 4th, most noticable when slightly accelerating up hill. I am a GM mechanic and i cannot figure this one out on my own. I have replaced the plugs with proper AC delco platinums, replaced both the mass air and throttle position sensors, replaced the air and fuel filters and i always run premium fuel. I have driven the car with the GM scan tool on 4 separate occasions and cannot see obvious data that will direct me to the problem. Did the car in this thread get corrected? Any help would be greatly appreciated.