car spits and sputters and obd code P0837

P0837 Description
Four Wheel Drive (4WD) Switch Circuit Range/Performance

So this is not your problem. have you checked fuel rail pressure? sounds like a fuel supply problem.

Yes everything with the fule system specs out and changed the fule pump and filter.

Have you had and are you getting any codes?

Yes I did get another code P0353 misfire on #3. So I pulled the coil pack/ rail, and the plug everything looked good there so then on to the connector and wiring. Nothing is melted or messed up so then I figured to check my 5v at the plug and everything checks out. I even changed my coil pack/ rail and did a hard reset and still the same old same.

I'm so confused this is driving me CRAZY!!!

Still have the misfire code, check for vacuum leak spray pattern for injector, you may have to do a cylinder /power balance test on an oscilloscope to see random coil low voltage, you will not see any visual evidence.

That's where Im at a loss I don't have access to those things and every shop wants to charge $ 80 to 100 an hr. Also here is the kicker, when I had replaced the computer it ran like a top for a week then all at once it stalled and gone to hell since. Im going to call the computer co. where I bought the new one and ask if they have done a diagnostic on the old computer to see if that might get me somewhere.
I spoke with a couple of Jeep dealers and they have never heard of the problems im having nor do they want any part of trying to help.

If you find out what was wrong with the original ECU post it here as this may give some insight into where to go next, shame that the dealers don't want to know.

I was hopping by talking it out with some one i could find or figure where i over looked something or forgot something.

You can check for vacuum leaks your self, with the engine running spray a little starter fluid around the inlet manifold gasket, vacuum ports and throttle body, the revs will pick up if you hit a leak.