low idle and then low power at 4500 rpms+, car idle's really low(only sometimes) Options

[midtownkc]

Hello,
ok my 94 gt which I've recently replaced about everything aside from the tranny/clutch/fuel pump, idles normal(7-800 rpms) but sometimes drops to about 400 rpms and almost dies. It does this without a fan kicking on or AC so not sure what the deal is. Also when I floor it, first gear, tires spin bla bla but at about 4500-5000 rpms the engine sounds fine but it feels like all accelerating power is lost until i switch into 2nd. Maybe its just my mind on the power loss scaring me!!! any thoughts appreciated.
edit** maybe the low rpms on occasion is my TPS? if so anyway to adjust or have to buy a new one?
kris

This post has been edited by midtownkc: Jul 8, 2010 - 5:30 PM

[OnAllFours]

Could have an intermittent missfire issue. If you have or know someone who does have a lab scope on hand, I'd be scoping your ignition coils to see if the dwell waveform looks okay.