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Hello,
I have been running just a COBB stage 1 tune for over a year now with no prior issues until recently, anytime I now get on WOT reaching between 3000-4000 rpm range, it almost is like I'm hitting a wall and it struggles to get past that 4000 rpm mark. I recently changed all spark plugs, disconnected my battery to reset the ECU learning, no CEL and I am still pulling boost. I don't think it is a misfire issue and I am beginning to think maybe it's a tuning issue. Any thoughts?
 
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