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Rough 30-40miles an hour

Posted: Tue Nov 12, 2019 5:36 pm
by NightSky
Hi,

I have seen similar type of topics but not identical to my case.

Car been a bit rough on 30-40miles per hour for few months time but for the past few weeks it became more visible while driving, it is getting worse, wheras before I would still had good amount of power once I floor it but now it does seem that I have lost about 30-40% of its power. Anyone dealt with this case?

Car: 2.0tsi custom rolling map, ramair air intake, R8 voils, full exhaust system, decat, diversion valve and custom rolling map

Thanks in advance for any suggestions.