i just rebuilt the heads, had it proffesionally tuned, went driving today and i went to test the AC and heat but right when i switched it on the engine shuts off right away. my guess is bad grounding on my part, 4 wires are not connected on the passanger side rear head, maybe its overloading the circut? so if anyone had an idea that would be great.

 

Sounds pretty logical for the grounds to not be hooked up since compressor coil takes so much amperage...........always start by hooking up all of the wires.