stumbling at 4.5rpm
 

wen i exceed 4.5rmp in 3 &4 i ger a stall i use to get a nice pikup than bout 5rpm it pickes up like nuthing happened whats going on? timming? fuel pumps 20 oz fast i know its not starving as it picks up n goes coud it have to do with a not so quiet exhaust?:banghead: