it began in the spring when I give wide open and let go the throttle the iddling gets down to around 1000 to 1500 rpm if backfires. Now at low speed it cuts and power goes down and backfires and also when iddle sometimes running on one piston. but when crusing fast everything goes good. I adjusted my throttle cable and changed plugs, spark plug wires, air filter and clean where throttle cable meets fuel injector i believe it is. Please help!!!

 

Sounds like short in tps wiring or maf sensor wiring,but with EFI anything possible. Run diagnostics on speedo,check for any codes. Manual shows how to do this. If still have problems,take to dealer to hook up and see if can find problem. BUT dont overlook the forrest for the trees! Check that air filter clean and replace plugs if still have Champions in(replace with NGK BKR6E or BKR7E! Could be all thats wrong! Good luck Sorry didnt read far enough on air filter change.