I have a simialar problem with my 134 converted 190 2.3-16. When I start the car for the first time and run the a/c, the idle is just fine until I shut off the engine. The next time I start the car, it idles really rough and seems to hunt. I asked about the pressures for high and low side and few weeks ago. The aux fan comes on and the compressor engages. The car has no problem cooling when the outside temp is 95 degrees but once it climbs to maybe 100, it cant keep up the cooling. The car was filled to the 2.2 lb capacity. I think it is overfilled. SHould I release a little bit? I have heard that the system should only be filled to 85% capacity or 1.85 lbs.