2003 mustang GT Misfiring
03 mustang gt 56,000
sct tune 93 oct
Full exhaust no headers
Accufab, Typhoon intake, throttle body don't know the size
My gas milage has stedly been decreasing alone with power. I have a little big of smoke coming out of the exhaust it is very light smells like gas no OIL! You know when you unplug the injecter off you can hear it pop right? Well you can hear that pop threwout the idle. It does it every couple of seconds and sounds just like a misfire. The car was orginally idling ruff, so I changed the IAC. Better Idle IAC was shot. It still jumps from 840 Rpm to 750 while in idle. If you listen very carefully just above the first two right cylinders. You can hear a very noticible tapping. Almost lost to a civic something is wrong I promise you and it wasn't boosted or cammed so I know its something.