90 240sx won't start after using ac

[MCCIRE]

I have a 90 240sx hatch w/98000 miles. My prob is that when i use the ac it works fine but the next time i start the car in runs for 3-5 secs and dies. If i wait a few or try starting it a few more times it finally starts and sometimes idles funny (low 600 not 750rpm) afterwards. When i don't use the ac it runs great. Anyone know about this?

BTW i put in new plugs,wires,cap and checked it while running and it fires fine but still can't "use" the ac. Any tips are greatly appreciated!

[adrenfreak]

theres a idle relay switch or solinoid that engages when you turn on the ac and raises the idle, maybe somethings wrong with that, i dont know anything else tha has to do with the ac

[MCCIRE]

Thanks! I'll check it out.