2002 Saturn Coupe acceleration miss problems.

Saturntech9

Thanks for your quick response, it is kind of worse when ac/heater is on. I had the "same problem" 2 years ago, but my mechanic replaced the intake manifold gasket, it worked ok until the past 6 month started happening againg I also changed the spark plug. I took the car back and to my mechanic but he "checked" the gasket and the spark plugs and said every thing looks ok. I was thinking it can be a sensor, thanks again