Can anyone help me with this problem. My 2.2 litre vectra sri 51 plate 3 months ago started running crap. It doesn't tick over proper - it's hunting bad, when setting off it tries to die and when travelling under 40 miles per hour it chudders/shakes really bad. Over 40 miles per hour it seems to run fine.
It's been on 2 diagnostic machines both showing no electrical faults or codes displayed it only showed that it was running very rich (It's using a lot more petrol than normal), all air pipes have been checked for leaks, exhaust and sensors have been checked also. It has recently been serviced but that didn't solve the problem. No lights showing up on dash either
If anyone can help me with this problem it would be much appreciated.
Thank you