with the pollen season on, i turn on my a/c and my idle jump up to 1200 and after is stop at a light or stopsign my idle drop to 500. Can anyone tell me whats the problem any help is welcome.

 

I have the same issue....I'll be at a stop light and idle at 500rpm, then turn on my A/C and my idle jumps between 500 and 900 rpm, but turn off the A/C and it goes back to 500rpm.

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Its probably just the ac clutch going on and off.

 

the a/c creates alot of parasitic drag on the engine and electrical. When the compressor comes on, the computer increases the idle to compensate or you would stall.

500 rpm is a little low for idle anyway.

 

Yeap it is. Normal idle s between 750 to 900. Its a common thing your engine is doing. No worries.