This car is driving me nuts.......First of all the car has an occasional engine miss. Sometimes is worse than others, when it is bad it is pretty bad. I put my scanner on it and I got engine misfires cylinder 1, 2, and 3 and random misfire. I also had a IAT sensor code.....not sure what that is. Ok here is the kicker. I changed all plugs and only the wires on the cylinders that had the misfire codes trying to save alittle cash. I did this and went and drove the car, the car does fine until I really give it alot of throttle, then it really bogs down and the check engine light comes back on and it runs bad again. I put the tester on the car and it still has the same codes it had before I replaced the plugs and wires, but now also has cylinder 5 misfire. I erased the codes and tried it again. Car did fine until I put it under a heavy load, same thing happened bogged down running awful and CEL appeared. Put the tester back on it, had all the same codes cylinder 1,2,3,5 and multi misfire and IAT. I now changed the coils on the original three bad cylinders 1-2-3 went and drove the car and the same thing happened again but now I got all the same misfires 1-2-3-5 and multi but now I got cylinder 8 added. I don't know what is going on with this car could something else be causing this? I would understand if I got different codes each time I suppose but not for cylinders 1,2 or 3. I have changed the plugs, wires and coils on all three of those cylinders and still get a misfire code for each one. I am at the end of my knowledge with this problem all help is appreciated.