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Argh!
I have also been having this problem off and on for just about a year now. I have been watching over that great period of time for any number of consistant circumstances, but have found almost none. It may go away for weeks, and then come back full force, sputtering popping and shuddering that it takes forever to attain 40mph. When I took it to a mechanic to just get analyzed, he said it was the number 3 or 5 cylinder (second and third from you on the passenger side whilst facing the car). I guess it made total sense, being that if the rubber "insulation" around the coil pack was bad that it would ground somewhere and cause that cylinder to misfire. But if this was the case...then wouldnt it be persistant? And also, (and maybe its like a placebo effect) it seems like sometimes when i fill up after being empty that it gets worse for a little while, but there is really no telling b/c its so random (also I just changed the fuel filter less than 2k ago, or at least Chike did it for me...haha)
-Andrew R.
Pitch us some help here!
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1992 Subaru SVX LS-L Ebony Mica: Custom Cold Air Intake, Smallcar Shift Kit, ECUtune Stage 1v4, Flowmaster Exhaust, UR underdrive pulley, 4.11 gears, iRotors Drilled and Slotted rotors, Axxis Brake Pads, 18" Enkei Wheels w/Pirelli Pzero Nero M+S, 20% Window Tinting, K&N Panel Filter, Rockford Fosgate Sound System w/XM Radio, Removed Intake Resonator *SOLD*
2003 Subaru WRX: 2003 Impreza WRX (Aspen White); Vishnu Stage II; IHI VF-34 Turbo; Walbro fuel pump, STi Injectors, Vishnu Up-pipe, Down-pipe and Signature 3" Cat-back; Samco Intercooler hoses; JIC Coilovers; STi A-arms; Whiteline swarbar bushings; Stoptech 13" rotors w/4-piston calipers; Braided Steel brake lines; 17" Rota Wheels with 225/45/17 Falken Azenis (R-Comp).
Charlottesville, VA Represent! (voted #1 place in America to live!) 
http://www.subaru-svx.net/photos/user.php?Amazonparrot
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