I had the same problem with the ppm 2 with the air 4 I had to ditch the air 4 I got rid of my intake/exhaust upgraded to a bigger ac sealed the shit out of everything and finally it works great you just have to mess with evrything to dial it in. Also does your ac have a built in thermostat or is it the old school type with the manual thermostat. If its the new type you can't have it plugged into it because most won't restart.