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I have the same problem, although I don't think mine is anywhere as severe. She still runs super strong, but I notice hesistation on acceleration - especially when it's cold.
here's my scenario:
From a stop, lightly accelerate where the Revs 'll go to about 1,500 then the sputter down to maybe 1250 (but you can feel it) then it launches back to normal (1500+ RPM) ......does all this while remaining constant on the accelerator.
If i just hit the pedal moderately it's fine - aggressively it's also fine ....floor it and it's still fine. I just figured this to be the problem that ECUTune's stage 1 chip is to fix.
I'm also due for a major 60k service, so after I do all that I'll see if it still does it.
Have you tried replacing the basics? Like plugs, clean the air filter, fuel filter, pcv ....all that?
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Mike - Proud owner of a Pearl 92 SVX LS-L 5MT with 78k miles and climbing 
5-Speed Status: DONE!
Lambo Door Status: On hold but will be a success
04 WRX 5MT, STi Short Throw Shifter, Group N tranny mounts, AZA Z-2 18x7.5 Rims, slotted/cross drilled rotors, stainless steel lines, 35/20% window tint, ecu bead crush, power mode button; 7" In-dash touch screen LCD, mobile computer, voice recognition, alpine PXA-H701 DSP, 2 JBL amps, focal speakers all around, 5 farad cap, and fiberglassed subs in the trunk.
The Mobile Computer Interface - featuring the SVX | My Locker | My Secret Stash
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