Quote Originally Posted by TDCRacing View Post
Well first off what do you have done to your car? It could be a lot of things. Give us a little more info.

Front plog,u-bend delete,zzp ported tb,3.3 pulley,1.9 rockers,overkill tune,u-drive pulleys. Everyone will say the pulley is too small but like I said I only get this at cruising speeds in 4th when the engine is under load. Maybe a fueling issue? I only run 93. Fuel filter was changed recently. I dunno but if it were under boost I would change pulleys butthe 8* KR has me stressed especially when its just cruising along. Dirty injectors?