whenever the heat is on auto or a/c on and the car is idling the rmp goes constantly up

Something else I forgot to add, the IAC (Idle Air Control) valve was replaced and checked for leaks.

If the IAC is good, check for vacuum leaks. If the check engine light is on, check for trouble codes. Most parts stores will scan it for free.

checked for vacuum leaks, it was ok; furthermore, no engine light on and scan does not bring any code. Big puzzle!!

Do me a favor. Get a vacuum gauge and check vacuum at the intake. also, make sure it is steady.

I picked the car up from the mechanic that he took actually out the intake manifold and did the testing; unfortunately, he didn't find anything else that a piece of wire that was left behind by someone, he thought it was it but no cigar.
He suggested to take the car to an A/C place to see if it could be a relay or something like that.

The IAC is what controld the idle. When the AC is turned on, the IAC should increase the RPM's

I suspect that the problem is the A/C cycling on and off too frequently. It is normal for the idle to kick up when the compressor comes on but if it's low on refrigerant or has a restriction in the system, it will cycle too frequently.

Ok, I could check the refrigerant but if it's ok, do you have an idea what else I should be looking into? I'm not mechanical incline so I have to take it to places and everyone what several 'Jackson' just to take a look! Thanks.