Going out on a limb here but on the Liberty's and on the Liberty forums, the 3.7 V6 has a problem of breaking valve springs, weak valve springs, etc. on valve springs. One of your Intake valve springs could be broken or worn so bad that the Intake valve isn't closing properly and could be throwing the miss fire code.
Of course that's a big if. How are your coils on each cylinder? Could one of some of them be bad causing the miss fire?
Last edited by criket; 06-02-2013 at 02:24 PM. Reason: Not thinking correctly, lack of sleep....
SOLD - 2005 | WK | Khaki | 3.7 | QT1 | OME HD Front Struts | Rusty's 2" lift in Rear w/ Monroe load levelers (F150 version) | 265/70 Nitto Terra Grapplers | 17" Moabs | 1.5" wheel spacers | Pinch weld mod | Rear fender trim mod | 4xG Matrix w/ reciever hitch | 4xG Belly guard | SOLID Diff cover | Cobra CB radio | 4xG CB radio antenna mount
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