Unburned fuel

Any fault codes to go on? You could try doing a return spill check on the injectors to see if any particular one is faulting .also ensure intake system is clean from filter to throttle.

Had a similar problem with an audi A4. Very important for that system to have the airflow meter working properly. The A4 i had was on limp with airflow fault code. I changed it for an aftermarket meter, the car drove better with no codes coming but surged alot on idle and hesitated when putting the foot down and was not burning fuel properly with the white smoke and smelly exhaust. Aftermarket air flow meter was giving the egr too wrong vacuum. Genuine meter solved the cars problem. Aftermarket meter the car may run badly with no fault codes. Worth checking.

Agree with " bustedknuckles" with suggestion of retun spill test suggestion .

cheers lads the garage also feels that the problem is around the injectors going in on wednesday for a live scan on his new machine whatever it is it wont be a cheap fix im not that lucky wil keep ypu posted
Regards
Zanderman

There was an issue with maf,and coolant temp sensor on a4 and Audi actually issued a bulletin on this,Unfortunetly this is a vauxhall,But a maf issue could still cause rough running,Think unburnt fuel would require a more severe issue such as cylinder not firing correctly or injector over fuelling.But then that is just my opinion .

the car does not use any oil or lose any coolant so think that the pistons etc are ok really feel that its a injector return solenoid problem or at worst the ecu costs about the same anyway but l hope this new machine will find out what the problem is we always think its the worst possible outcome but sometimes its a pleasant suprise keep you posted as its all a learning curve good job the garage l use are reputable and fair

Zanderman