09-21-2012, 01:13 PM
Misfires can be so many things, but check
MAF- Unplug and plug back in, see if it changes the idle.
Spark plugs, all of 8 bucks total at advance auto, might as well (coppers)
Vacuum leak (yes it will show up across all 4 cylinders as a misfire)
Coil packs ( you have them, might as well swap, but I doubt all 4 cylinder misfire)
I highly doubt its the fuel pump, but may be a regulator. If it was the fuel pump you would have issues other than idle.
MAF- Unplug and plug back in, see if it changes the idle.
Spark plugs, all of 8 bucks total at advance auto, might as well (coppers)
Vacuum leak (yes it will show up across all 4 cylinders as a misfire)
Coil packs ( you have them, might as well swap, but I doubt all 4 cylinder misfire)
I highly doubt its the fuel pump, but may be a regulator. If it was the fuel pump you would have issues other than idle.
2020 Ford Raptor
2009 Z06
1986.5 Porsche 928S
2009 Z06
1986.5 Porsche 928S