I switched from a 2.7 to a 3.2 in my 01 intrepid. The doner was a 99 and I took engine , trans, all accessories, rad, pipes and ECUs. I had the dealer put my SKIM code in the 3.2 PCM and the car ran great til I needed air. I had to switch back to the 2.7 PCM to get the air to go on (guess the 99 had ATC and the 01 has manual). Thats when things got really interesting. The car ran nicer with the 2.7 PCM once underway and had more snap but uses more gas, seeks a bit for idle speed when running, revs up for a split second when shifted to park and revs high (2000+) on start up. Also on initial start up it will shut down for about 30 sec. if not fully warmed before travelling. Shut down is at 3/4 operating temperature. Is the steering pressure switch circuit missing on the 3.2 causing the 2.7 PCM to mess up. Can the 3.2 PCM be made to recognize the manual temp control A/C. Also the 99 3.2 car didnt have a leak detection solenoid, is this the trouble, Is the 2.7 PCM having trouble with the 3.2 transmission ECU. Help.