I had the fuel filter replaced,and that was not the problem. I also changed the cap and rotor,and the rotor was totally shot,its a wonder the car ran at all,however,that still did not cure the problem,it still ran awful. I started looking all over the engine for something loose,and found nothing,and thought what the hell,might as well look at the fuse box in the engine,and sure enough,one of the fuses for one side of the fuel injection was blown,put in a new 7.5amp fuse and the car is back to normal. I really hate to think how much money I'd have spent if I took it back to the shop,for a blown fuse.