Looks like you covered a lot of the areas that could be the problem...
I know its natural for rpms to drop a little when the ac is turned on but if the car is also feling sluggish when acellerating, I would check the cap and rotor/sparkplugs and wires...
How is your idle? I would check the egr vacum module thingy's along your firewall as wel... I remeber when my car felt sluggish, these are things I tried...
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