START OUT AND ENGINE LIGHT COMES ON , CODE P1734. I HAVE SHIFT BUT NOT ALL, CLEAR CODE WITH OBD2 UNIT AND JEEP WORKS GREAT, SHIFTING IS NORMAL. I HAVE REPLACED PRESSURE SWITCH, SHIFT SENSOR, STILL HAVE PROBLEM. ONCE THE CODE IS CLEARED, IT WORK GREAT.

There are too many variable here to give you an accurate diagnoisis without a hands on inspection. I appreciate the trouble code but considering you have already replaced parts, its best to bring it to a shop for a complete diagnosis. I'd hate to see you throw anymore money away on guessing. Here is a link to find a shop near you. https://repairpal.com/repair-shops Alex