Hi! I hope I get a few tips which solves the problem because the workshop couldn’t help me. Auto: Mazda 3 BK 2.0 Suction engine Built 2008 I have a swallowing of the engine at quite exactly 3000 revolutions in case of easy acceleration, but then it’s also immediately gone away, everything is normal before that. However, when passing through the accelerator, this doesn’t occur! The strongest is in the 2nd and 3rd gears, it only comes from time to time during the day, but as soon as there is no 8 is actually going to be every time! Gas is electronic. Maybe it would still be important to mention that I have installed a subwoofer if it has something to do with the electronics. New was made on suspicion: -Zündkerzen -Drosselklappe was freshly cleaned this had but also few black splashes -New air filter Thanks in advance Lg