Hi guys, I'd like some input-mainly to validate my own conclusion before I start buying parts.
Last week I was driving home from work-70ish on the interstate and all of a sudden she (2002 Wrangler-4.0l) fell on her nose and started misfiring-vibrating like crazy under throttle and the the check engine light started flashing. I slowed down to about 55 and she was better but obviously still missing. I was meeting my parents for dinner so I checked the codes and pulled a 300 (misfire detected-duh), 301-cylinder #1 misfiring and 304-cylinder #4 misfiring. When I came out of the restaurant I wanted my dad to listen to her. Started up and ran smooth as a kitten purring. I periodically rechecked the codes over the next few days and they were still there but I hadn't felt the engine misfire. So I chocked it up to moisture since I had cleaned up the engine the day before at the car wash.
But its never that easy. Coming to work this morning it misfired a few times. Nothing as severe as the first time but I could feel the occasional stutter on the interstate. I'm thinking coil rail instead of injectors since cylinders #1 and #4 are companion cylinders and share a coil pack. Unfortunately it looks like I have to buy the whole rail instead of just one coil pack. :thumbdown:
So aside from changing the plugs while I've got it apart does anyone have another suggestion or does this sound on target?