Re: EA problems
the "wire" you're talking about, is actually the accelerator cable. it is probably streched, explaining you'r slow acceleration - replace it.
the "head-gasket" leak you're talking about is the rocker cover gasket, not nearly as big of a worry as a head gasket!
give the engine bay a good degrease and high-preasure wash, being careful not to get any water into the distributor (put a plastic bag over it if you wish). this will get rid of any junk from the bay and allow you to see exactly where the oil is leaking.
as for the AC, when they regassed it, they should have done a leak test for you. i would take it back to whoever regassed it and demand them to find the leak and regass it for free once you've fixed whatever is leaking