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Re: Problems with idle when a/c is on!!! (vetterdstr)
You say highly modded. What kinds of mods?
If the car is cammed it may require a 7/32-1/4" hole in the throttle blade. The PCM may not be able to respond to the additional load that the A/C is adding. The hole will allow more air to enter so the PCM has less correction to deal with.