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Concerning the oil leak: If the oil is leaking onto the exhaust pipe, then it is coming from either the valve cover gasket/plugs, distributor (assuming your 5sfe has one?), rear main seal, or any combination of these. In addition to the valve cover gasket, the distributor housing o-ring is another common source of oil leaks. Do you see oil running down the side of the cylinder head?
If you could post pictures it would be much easier to pinpoint the source.
As far as your engine being sluggish - my first reaction is that it is a transmission problem, but it's hard to say at this point. Check the ATF (it is an automatic, right?) - should be at the proper level and not dark, burnt-smelling, etc. Does it run fine at idle, and in other gears besides 1st. Does it feel like it is hesitating/misfiring?
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