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

[Jamchell]

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.

Has it been doing this since you got the car? I also have a GT and it's normal for the 5s-fe to fall on it's face at around 4800 rpm, mine does this as well and so have 4cyl camrys I've driven.

It's possible you have a dirty throttle body which will cause the idle to vary, also your car may be having fuel delivery issues of some sort.