Hi I need help my 90 300 TT has a 34 code but it seems to have other issues starts after cranking for a while sounds like it is running on 2 cylinders after a minute or 2 will rev to about 2 thousand RPM wants too die but you can keep it going put it in gear doesn’t have enough power to move the car only code I get is 34 what to do ? All stock been sitting before I got it I did Timing belt service it ran for about a week ok now this ?