Okay, I have a 260Z. When my brother was driving it from Utah here to Arkansas it was running okay, and later on the trip it started running like crap. Really doggy slow, no acceleration. So he called the prev owner and asked what could be causing it. He said that the gas on the screw-in coils of the second spark plug from the firewall needed to be cleaned. So my bro cleaned the coils and it ran GREAT! So everytime he stopped for gas he cleaned them. Well, I decided that I did not want to go through with this for a long while. So, does anybody know what could POSSIBLY be causing this? Or does anybody how to fix the problem? Any/all help would be very much appreciated.