I have owned my Astra for over 15 months now, but for the last 3 months it has been performing really poorly. The problem being that when i get to approx 1400-1700 revs the engine shakes and the whole cars judders about!!?? Once you go beyond this it runs normally. The problem being that i now drive in a gear lower than i need to, therefore keeping the revs high
This happens when in neutral as well as any gear. My local garage doesn't know what the problem is and sprayed the engine parts with WD40!
Any ideas what is causing the problem and how it can be resolved
Thanks in advance