Can anyone please help before i waste a sackload of cash!.Audi a4 1.8 98 model...It has a flatspot/loss of power and sometimes feels like its running on 3 cyls.ive changed the air meter and coilthng on top but aint made any diff.pulling my hair out here...plz help!

 

go clear your cel. there might be a stored code that isn't lighting up the light that could be giving you trouble

 

thanks mate! had 5 codes cleared,runs gr8 now.