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Car just randomly started running slower not boosting properly in 1st and second ..

Iv changed the turbo
Changed injectors
Changed the map
Changed maf
Changed n75
Also put a new headgasket on with pd150 headbolts the only thing I haven't changed is the tandem pump would this cause boosting problems iv also smoke tested the car and I have no leaks and also fitted a fmic and changed fuel and airfilter im litreally on my last legs with this car and Iv had it scanned with vcd and no codes are showing answer are very much appreciated as I'm running out of options love to see what people come up with 🤞🤞✌
 

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2016 Jetta, 2001 Jetta, 2015 HD FLHTCUL
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are any of those parts upgrades beside the flic? Sounds like they might have changed ecm parameters and a tune might be needed
 
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