When the car is in drive and i let off the brake my car surges forward almost like its misfiring. But when i get on the gas it runs fine. Even when my car is in park it has a rough idle too. any suggestions
thanks

 

anybody know??

 

Check/clean your EGR system.....as well as your throttle body

 

Ah the dreaded egr system.

 

Get some Sea Foam and clean out the throttle body and intakes.
Or for alot more money go professional for some BG cleaning.

 

one day i was installing the cold air intake, and i came to realize how dirty my throttle body was. i sprayed some thottle body cleaner and used a tooth brush to clean it up. i wipedd all the dirt within my reach. but i forgot to turn on the engine and blow the rest of them out!!!. it turns out that the dirt and gum prolly stayed in the manifold area and most likely dirtied my injectors, too. it starts jerking at idle and keeps jerking at very low rpms. but when i rev up the car, it seems fine. but there is significant loss of power. so i went to autozone and bought some valvoline injector cleaner and flushed it in the fuel system with a full tank of gas. after driving a few rounds at wide open throttle, the car returns to normal driving condition.