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hmm i was going to say it could be your spark plugs/wires/dist. or maybe clogged injectors or a clogged fuel filter. but you say it runs fine till 5k.
maybe your clutch is slipping, that could also be a problem yet i think this would be affecting you at just about every rpm, not just 5k and up.
if i were you id get yourself a voltmeter and check out the TPS and see if its working correctly. A problem with the TPS circuits will throw a code.....
i can list the procedure to check the voltage on the TPS if youd like and it will tell you if anything is wrong with that. just lemme know.
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