My brothers 172 judders violently between 30 and 50MPH, any other speed, it's fine. It's been in to the garage and they have checked it over. Everything is tight, nothing hanging off, tyres balanced correctly, engine mounts are OK etc. but they can't find anything wrong with it. I've had a quick look on here and someone has had a similar problem and it was the coil pack?! Could this be a factor?!
Thanks in advance for any advice.
Thanks in advance for any advice.
