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Sounds like its in limp mode, as said above check the wiring to the Maf. Then check voltage on the CTS and TPS. I'd also pull the plugs just to make sure its not running so rich its fouling out plugs and keeping the engine from being able to free rev. Once you check those things let us know and I can make more suggestions if its not fixed yet.
Also what MAF are you running? DO you have any SAFC or anything that you can monitor the MAF voltage as well as TPS voltage?
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