2000 GT won't rev past 3000 RPM

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+1 on above. Double check that the "check engine" light isn't burned out. Remember there is a "lamp test" for all lamps at initial key on.

Is this an automatic or manual? If automatic, are there any issues with the shift lever? Might be handy to confirm that the PCM knows the correct shift state. IE, if the PCM thinks the transmission is in neutral when actually in drive, this would limit the RPM's.
 
Had a problem similar with our 01, filler neck had rusted and dumped rust in the gas tank, pump sock was clogged starving the engine for fuel. Eventually it got so bad the car would stall. This did not give a check engine light.
 
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