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Could be quite a few things, did they replace spark plugs? If the gap is too wide you can get that type of hesitation even with zero knock. Another thing might be a boost leak of some sort, check all your hose clamps and make sure the everything looks good underhood. The stock flash from Mitsu, even the latest, is still way rich with high timing so likely a good tune for 11.0-11.5 AFR's along with appropriate timing and increased boost will clean up the rotten factory tune.
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Chris Wirth
RochesterDSM.org
2008 GG Evolution X (New numbers soon!)
- Garrett GT3076R
- Full-Race Tubular Exhaust Manifold - 800 CC Inj - Walbro FP
- ETS 4" FMIC - ETS 2.5" IC Pipes - AMS Intake
- ETS 3" Dual CB - ATP O2 Downpipe w/ 44mm Tial
- MBC 25/27 psi - Works BOV - EcuFlash Tune
- ACT-ME1-HDG6 Clutch - ACT Streetlite Flywheel
- Selling Forge WGA, ETS Headers, & UR O2 DP
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