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Did your shudder/stumble feel anything like a hesitation and lack of boost? I know 20k is a bit low to look at an intake cleaning. I had hesitation issues with boost delivery around that rpm range. Once the intake was cleaned up, problem was gone. Then again, I had 58k on the clock. I also had one instance click the SES on and drop into limp mode. I was able to keep driving on limp mode for another 10 minutes and the SES light and limp mode went away.
Just tossing out a thought.
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1996 Trans Am WS6 (RiP)
2002 Trans Am Collector Edition WS6 - Not Stock @ 425 rwhp
2006 VW GTi - APR Goodies - Sold
2011 1M - VO Florida pick up 11/4/11 #554 of 740 - Sold
2017 ATS-V Stock
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