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Fg hunting when light throttle


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My fg is hunting on real light throttle threw a car park or when coming down revs to idle will level back out after 3 or 4 hunts 

is on e85 tuned by pcmtec the guy that tuned it is 4hours away from me so can’t take it back to him 

any advice would help just bought the car 4 weeks ago was tuned when I got it 

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If you have previous tuning experience that is an option. Remember that you might have mechanical issues like a fuel pump that is too big causing pressure surges, blocked injectors, O2 sensor positioning etc which can't be tuned around. Without all the mechanical equipment to verify you may end up chasing your tail. 

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