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Hey guys my 2.0L since first service when i noticed it has a dead spot about 3500rpm in 2nd to 4th gear. in any of those gears the tacho will drop slightly, bounce then rev back up. Whilst loosing power. it is really pissing me off and hyundai at the last service said they found the problem and fixed but it is still there and is getting more consitant. Has any one else found this problem? Or suggest what it is. I think it might need and ECU remap or maybe i have a faulty sensor, like and ehaust flow or intake cfm.