does it "pop " ? Mines doing something similar, and includes backfiring through the intake. Only does it upon start up for about 5 minutes then runs fine the rest of the time, but if I shut it off to go in a store it does it again.
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98' passenger front door lock issue.
Not sure if this was an issue prior to me having the XJ or not. The day I picked her up the window regulator failed and the window fell down inside the door. I replaced the regulator and the door lock hasn't worked correctly since.
Has power, hear it...