Chrysler Repair: no code no 4 cyl missfire under load, snap on mt2500, high tension wire

Question
I have a 98 grand caravan with 3.3l v6 flex fuel. I keep getting a missfire under load in no.4 cyl. scanned with a snap on mt2500 and got no codes. all readings appear normal except in missfire indicators no 4 cyl gets any where from 120 to 260 counts.checked fuel pressure and volume within spec.checked wiring no problems found.checked compression 145 lbs. checked ignition ok. replaced fuel injector. still same problem. any help appreciated.

Answer
Hi Steve,
Have you checked the high tension wire from the spark coil pack to the the #4 plug. It may be arcing to ground. Maybe just replace that wire and see if that solves the problem. Also check the resistance between the #4 and #1 high tension coil pack terminals. It should be 7,000 to 15,800 ohms.
Roland