xjk9bar1 Posted July 18, 2006 Share Posted July 18, 2006 I've been a previous owner of a XJ, current owner of a LJ, WK, and now a new proud owner of a '87 MJ for a DD. I'm having one issue getting it ready. The MJ starts and idles fine, but during acceleration it will bog out/miss fire...couldn't get it to rev over 2K without it missing. What I've done: new oil pump/distributor/wires/plugs replaced broken vaccum lines with newused lines from donor '89 XJ new fuel filter new cat/muffler Now the MJ will rev up to 4K with slow/smooth acceleration sitting in the garage. On quick acceleration/test drive, it boggs out again at when trying to accelerate. What is your concensus? Is the timing off a tooth? Should I do the TDC/distributor again? I have tried "search" with little results...maybe I'm not looking or typing the right key words. Thanks, Joe Colorado Springs, CO Link to comment Share on other sites More sharing options...
feerocknok Posted July 19, 2006 Share Posted July 19, 2006 Maybe a mixture problem? What engine? Link to comment Share on other sites More sharing options...
DirtyComanche Posted July 19, 2006 Share Posted July 19, 2006 TPS. Link to comment Share on other sites More sharing options...
xjk9bar1 Posted July 19, 2006 Author Share Posted July 19, 2006 Maybe a mixture problem? What engine? My bad....4.0 Link to comment Share on other sites More sharing options...
pingpong Posted July 20, 2006 Share Posted July 20, 2006 fuel pump, or fuel pressure.... one or the other Link to comment Share on other sites More sharing options...
87manche Posted July 20, 2006 Share Posted July 20, 2006 you say new dist, did you index it when you installed it? a dist a tooth off will usualy idle fine, then run poorly as you get higher into the RPMs Link to comment Share on other sites More sharing options...
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