philemon

I attempted toi take off my timning belt. I got all the way toi the crankbolt and I could not get it off. I used an impact wrench, but it wasn;t sucessful. I put everything back in oreder and now the card deosnt run correctly. It misses and will not accelerate. What could be the problem. I am taiking the car to the shop on Monday monring to have the belt replaced. Thanks for your help. philemon 97 Lesxus LS 400