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Sounds very similar to my friend's ST2. IT would run up to about 4K, stumble, and then over that it ran well. His turnd out to be the TPS. You should be able to verify the TPS with a DC Voltmeter. You're looking for a "clean" climbing voltage from the idle position to wide open. Any glitchy readings would indicate that the pot is bad.

He had a dealer diagnose and fix his, at the time.
 
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