Pulled codes today...

[bobtodd]

I had written an earlier post about losing my top end power. Well, after searching through posts the last few days, I've found that it could be a few different things. Worn valve springs, lean fuel problem, TPS, timing, etc. Well, I was leaning more towards worn valve springs. The car use to pull super hard all the way up to 6 grand with no signs of letting up when I first bought it...about 5 months ago. Now the car has lost its top end power and pulls decent up to about 4500 rpms...after that it revs but there isnt any of that "pull" feel like it use to be.
I checked my timing and that is fine. I still have to get a fuel pressure gauge to check how my FP is under load.
I decided to go ahead and purchase a code reader. I hooked it up this morning and go the following codes...

KOEO
51 - ECT sensor out of range indicated..what is the ECT sensor?
22 - MAP or BARO sensor out of range...?
23 - TPS out of range....which is one of the things I am having problems with
67 - NDS circuit failure or A/C input high....I removed my A/C...could that cause any problems?

I got my dads voltmeter so I am going to go mess with the TPS some more today. I know I should be reading around .98 with the car warm. I dont know if I'm just not getting a good reading but before when testing the TPS I was getting .7's I did buy a new TPS and it shows the same numbers. I am going to put my old one back on and take some of the insulation off the green wire to possibly get a better reading.

So, besides the tps could anything else pulled from these codes cause my top end power loss?
When removing my A/C could I have unplugged anything to lose vacuum? Since I dont have A/C can I just pull the A/C vacuum hose off the tree and plug it?
Well, if anyone has some ideas I'd appreciate. Thank you!