1998 Jeep 4.0 ltr H.E.L.P

Bullfrog98

NAXJA Forum User
Location
Alabama
Howdy fellow jeepers,
SO I'm re opening a discussion because I can't find someone who has the exact same issue as me. I've looked everywhere.
All that aside, i orginially has an exhaust header leak, and I let it go too long of course, and so finally it got to where it sounded like my jeep was falling apart.
So I replaced the header, and got it all back together, cranked it and it backfired into the manifold. So I blew a valve seal. That eventually turned into me overhauling the whole top end. Brand new head, seals, valves, rocker arms, rods and all new gaskets etc. So after I put the mothership back together, I cranked it and it ran super rough. And it has ever since. It stumbles at idle and stumbles and misses through 1800 rpm. But at 2000 it smoothes out and drives fine but as soon as I let off the throttle, it goes back to its bad habit. And it's constant every time. I've read that some people have this problem only ever so often. And I've checked for vaccum leaks. Checked injectors, fuel pump is fine, throttle body is fine. The only things I haven't checked is the IAC and TPS. I ordered a new CPS a couple days ago, because I knew it was bad and I've heard that that sensor could be my pr
 
Non champion plugs? Mine and other's have done the same thing with other brands that have the same specs and should work but don't. I think it's just like using a Bosch O2 sensor, though mine actually seems happy with that one while lots of others aren't.
 
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