sourcemine

rpm's drop when A/C is off, when the A/C isn't on the rpms flow from about 700 down to 400 and repeat back and forth.

When it comes down to 400 rpm's the Check Engine light comes on, otherwise it shuts back off. ODB was checked, shop said it was the MAF sensor.

Purchased another MAF to try, any other suggestions?

Also cleaned out the idle control valve which another mechanic said to check becuase it affects the idle speed when it's on/off.

SCV8

Having the A/C on just advances the ignition timing a little, and raises the idle a bit. I'd look for a huge vacume leak before getting a replacement MAF.

Luke_in_SD

Hate to revive this thread but I am having the same problem

sourcemine

Some of my wires had been chewed up from the car being old, took two days, they went through every contact point and fixed it with electrical tape and going through everything.

Good luck