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Take it to the dealer and have it checked on diagnostics as this will bring up an error code telling you what the problem is, it could be that when you changed your bits and pieces you may have triggered an error code on the computer and you will have to have it cleared to put things right,or it could be that the cps has triggered an error code and you will need to clear it to get the car running again i had the same problem with my cherokee and i changed the cps but it still would not start and it was only by chance that i found out from a friend who works on them that i found out about the computer error, but because i live in the sticks of egypt there was no where to get it done so my friend told me how to bypass the error code on the computer and it has been fine ever since hope this helps
Transmission Control System Electrical=P0702 code, Have you talked to a jeep dealer yet, Ask if there are any TSB's on this problem. Technical Service Bulletins from Jeep when they find and solve different complaints. What ever is doing this is a soft code,A soft code is one that will clear it's self with the cycle of the key to off then on and code goes away,But have them check history codes to see if it is there.it sounds like it is going into limp mode,this feature is when the computer sees a transmission falt it wont up shift,so you don't harm the tranny,but will let you limp to a shop to get repaired.have you ever noticed the speedometer going to 0 then this happens? that would be the output sensor.