Re: 2005 3.7 misfire
I am sorry but the most common misfire cause on the 3.7 that I see is cylinder integrity, valve properly seating or carbon buildup... 9 times out of 10 with a 3.7l misfire your looking at having the head removed to either replace the head or valves. That is if your not lucky and a de-carb doesnt work.
It may be a CKP or CMP sensor with an intermittant signal but the likelyhood of one of these sensors A: causing a misfire that is actually counted as a misfire and B: that it would count a misfire on the same cylinder repeatedly is just about slim to none... I am just saying typically it is as stated above.
2005 Jeep Grand Cherokee - Gone but not forgotten!