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Good point, the motor has been in "many states of tune" getting it where it is. I have however noticed some very light pinging, so something isn't completely happy yet. Also stalling if I don't let it warm up and/or goose it in the mornings. If you're reading this mess, I should add that now...

Quick update on progress: Because the Previous Owner told me that "it was just tuned up" I never checked the plugs assuming they were good, and I had some sensor/vac issue. I cleaned the air sensor which was somewhat cruddy, pulled and held a vac on the MAP sensor line, and took out what were...

I have 3 XJs, I can easily replace the MAP Vac line and see what happens. Correct on the "maybe both"- hence my comment on what I take away from hours of reading the forums is that it could be anything- but there are things I have not cleaned or adjusted or replaced. Checking the fuel- I had...

Thanks- all good observations. The detail was about trying to head off all of those questions, and give an exact picture of what was done... and maybe help someone else. The top two issues you identified: I replaced the 02 sensor with a Bosch "wire-it-yourself" sensor. I'm certain that I got...

BUMP Too much detail?

Hey Guys- I have an issue with my 94 XJ that is driving me crazy. I read many posts on this topic before asking these questions. Here's what's up: I bought this 94 4.0 Auto XJ last year with 90K on it, but it needed some love here in the NE rust belt (ha. 90K and newly replaced floors)...