jetta 1.8t misfire on 3rd and 4th cyl.
 

Hi guys, I have a 2003 jetta 1.8T and the scanner shows misfiring on 3 and 4 cylinders. Before I spend alot of money on coils and wires, does anybody know of anything else that could be causing the problem. I replaced the plugs already. Any suggestion would be appreciated. Thanks Jack