lawsoncl

Put the original TPS and MAP back on and see if the problem goes away. You wouldn't be the first person to get a dud right out of the box. An exhaust leak that bad might have melted wires too. The exhaust wrap probably added to the problem. Check you're motor mounts too.

doublechaz

What is the pressure range of the gauge you put on it? Pegged doesn't really tell us much.

Kjc50

The gauge is compound meter and Max's out at 10psig there's a stop post there so it can't go any further. I've checked both lines for blockage and both are clear fuel filter is new and so s regulator.

4.3L XJ

10 psi is not enough. It is supposed to run at idle at about 33 pounds. This would have been nice to know since the things I have suggested were with the assumption that you were running at 50 psi or higher

Rogue4x4

You mentioned that it's surging at idle, yes? Have you cleaned the IAC valve? Easy and cheap to do...

https://www.cherokeeforum.com/f51/th...eaning-179079/

I would also suggest verifying the pressure at the rail, most parts stores have tools for rent...

And, as stated above, once you get it running, definitely check your motor and transmission mounts, that header screams worn mounts, haha

Kjc50

I apologize I'm not that sure of what I'm doing or in what order they could go , this is the gauge I'm using I may be looking at wrong but it doesn't go that high so I'm obviously doing something wrong or the gauge is wrong ?

4.3L XJ

I see what you mean. That gauge is designed for a carbureted system where typical fuel pressure is only about 2 - 6 psi

Kjc50

I can get to idle at 1100 to 1300 but only with the map sensor vac unhooked, and no reading at the temp gauge ,this has got to be several things wrong not just one component causing all these problems. Is there any chance it jumped timing ?
THanks again Have a day

Kjc50

So I need different gauge what's the decent gauge get living on a budget any suggestions thank you

4.3L XJ

You can pick one up at Harbor Freight. You don't have to be exact, juist in the ball park

bluejeep2001

I think you can rent them from advance or autozone for free.....you buy it, then they allow you to use it and return it , then they give you all your money back ....a decent alternative if you cant buy one