Get your basics done first and if you find out that you need injector work done, PM me. I pop test injectors for free if you cover the shipping.

Also, make sure your transmission is shifting according to spec. A trans that does not shift at the proper timing, etc can have the same effect as a severely low powered engine.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge