I have an '03 GT autostick, too, with 18k miles, airbox silencers removed and a K&N, and I have a similar problem with misfire under load, but at much lower RPM than 5200 (say in the 2500-3500 range).
It's been that way from day 1. Haven't been to the dealer yet (can't bring myself to leave Zippy with something akin to a black hole (a.k.a. the service department) for a day...)
Zippy doesn't seem to miss at higher RPM, either, only the lower RPM, so I can't see how the TSB would apply. I haven't checked the sparkplugs for fouling or the wires for arcing yet...
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JC Moore, \'03 Cranberry GT, a.k.a. \"Zippy\"
http://www.mooresmopars.com/GT-Cruiser/index-gt.html
Stage1, BTG Strut Bar, Sun Hyperground system, Prototype Power CAI, no silencers, Eibach ProKit, Borla 2.5\" SSTL single w/dual tip, APC 2G Carbon Fiber Taillights, Chrome Fuel door, \'02 foldaway heated mirrors, OEM-style rear spoiler, Progress 22mm rear sway bar, TYC backup lights, Magnecor 8.5mm, stock plugs, MB Design \"Shifter\" 17x7.5 wheels, Goodyear Eagle F1 GS-D3 235/45/ZR17 tires
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