Engine skips when ac is engaged or when i excellerate

AC on the fritz. When the AC clutch engages, it robs a lot of engine power. When you have your heater control on defrost, it engages the AC to dry the air so your windshield doesn't fog. Try unplugging the wiring harness going to the AC pump and see if that helps.

THE DEFROST SETTING CALLS FORE THE AC COMPRESSOR TO ENGAGE TO DRY THE HUMIDITY. THE CAR IS STALLING PERHAPS BECAUSE OF THE LOAD PUT UPON THE ENGINE BY THE ENGAGEMENT OF THE AC COMPRESSOR. THE COMPRESSOR MAY BE LOCKED UP

What are the trouble codes set? Get them read for free at most auto parts stores.

Air conditioner clutch is going bad and needs to be replaced.

Knowing make model and year would help. Most newer vehicles, 2000 and newer, will adjust the idle control up to compensate for the compressor engaging. Possible there is an issue in the idle air control valve or electrical circuit.

I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Load placed on the engine takes place when the Compressor clutch engages. It will not engage if the system charge is too low on freon. It needs to be checked with a gauge, I think that may be your problem.

check for vaccum leak or check throttle body and clean

You may have a sparkplug that is carbon tracking. Replace plugs and check coil to plug connectors or coils.

A crank sensor will do that.