I have a V10 2002 Excursion and have a misfire as well as the P0720 code. Replaces 4 COP that had worn boots and all the plugs, swapped the OSS and also ran it with the 4 prong plug off the alternator
as I have heard that can cause the issue. Still missing and dies often when stopped. Issue is beteen idle and 2K RPMs
JA: Have you seen the misfire code before? Has the car been stalling?
Customer: No misfire codes the P0720 is the OSS code stalls almost every time it's stopped
JA: OK. To minimize me, please click the down arrow at the top right corner of this box.
JA: Are you fixing your Excursion yourself? What have you tried so far?
Customer: No at a local shop. We have replaced all the spark plugs
, 4 COPs that were original and had worn out boots as well as the OSS
JA: Anything else you want the mechanic to know before I connect you?
Customer: We tried running it with the alternator unplugged since we read on a forum that a bad alternator could cause this as well