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I had a performance chip installed in my 88 when i bought it in 2005. After about two years of rough idle and poor gas mileage, I found the original Porsche chip in the box of parts I had from the original sale. It cleared up the idle, the mileage improved, and I really couldn’t tell the difference in performance. It might be a good step to go back to stock to rule some things out. Good luck.
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2002 GMC Yukon SLE - 4AT - Purchased New in 2002
1988 911 Cab - 5MT - Purchased Used in 2005
2008 Cayman - 5MT - Purchased New in 2007
2014 911/50 - #1173 - 7MT - Purchased CPO in 2014
2019 Macan S - 7PDK - Euro Delivery/New in July 2019
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