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im sure its running by now but the search on jeep always lands here.
so ill answer,
no engine size stated? so no answer, but..
the I6 is four liter is, 153624
the 4.7l is on page 62, engine chapter. V8
the #1 cyl is front on inline 6
the #1 cyl. is same on v8 and v6, one cylinder is just tad more forward
that be cyl 1 and bank 1 too. in this case left bank is forward 1.
There is a cover on the passenger on top of the engine that needs to be removed first.Once the cover is removed starting from the front of the engine number 4 cyl is the fourth one back. If this engine is an inline 6 cyl 4.2 the cylinders are numbered starting from the front of the engine 123456 number 6 is closest to the firewall.
make sure you have it on number 1 cyl top dead center, cause you can actually have it on number 6 cyl instead of number 1... seen it many times, same as on 4 cyl inline... its that inline thing going on...
Well it could be many things, But have you relpaced the dist. cap and rotor, within the last 15,000 miles or wires and plugs??? next step is the coil ? then it gets fun. like timing. but I think most jeeps with a Inline 6 have a bullet proof engine for the most part. As we all know there is plenty of semi's on the road. well the same set up is there. as an Inline Jeep. I would have to say 90% of semi's on the road are inline 6 cyl. engines. and may of them go to 1million miles.
so plugs,wires, cap, rotor and ignition coil. that is a good starting point.