Hey guys, been trying to chase down the cause of my rough idle and missing under load at low rpms.


1993 ZJ 4.0 4x4 Auto

So far:
Cleaned throttle body
Replaced iac
Replaced tps
Replaced dist, wires and plugs
Checked for vacuum leaks
Unhooked battery for 12hr and charged with a trickle charger

Well, I found this connector unhooked while crawling around on the ground


Anyone know where it`s supposed to go?

And I dont want to hear anything about the fram filter lol. I`m refusing to change the oil until this thing runs right. Just picked her up a couple of weeks ago and havent had the chance to drive her for more than a couple of blocks around my neighborhood .

The engine smooths out around 2000rpms or so but misses badly on take off and vibrates the steering wheel at idle.

 

Do a compression test, and there is a low cylinder or two, do a cylinder leak down test. A valve that is not sealing correctly will cause a rough idle and clear up at around 2000 rpm. I'm pretty sure that plug is not the cause of your problem.

 

tell you the truth that kinda looks like the plug that goes to the coil its on left side two wire otherwise the cam sensor three wire the cps three wire i belive the oil pressure sensor 1 wire where does that wire lead to