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Are you actually feeling the misfires or are you getting the P0300 code while cruising? The 03's are notorious for picking up phantom knock and tripping the P0300 code. It's pretty well thought that the transmission is the source of the noise setting off the knock sensor. Shep Trans and TRE both have "fixes" for that. I have a TRE trans and I still get P0300 every once in awhile but not nearly as much as I did on the stock trans.
The Mitsu flash for this problem didn't do a darn thing for my car. Your flash may also be part of the culprit so I would do some logging and see what kind of knock-count you are getting in those RPM ranges. If it looks normal then I'll bet dollars it's the same gremlin that nearly all 03's have.
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