Took it apart, you were right Olds... the new carb has a 4.5. So now I know that this is a problem... I have a 2.5 & 3.5, so will start w/ the 2.5 & see what it is like. Probably have to get a ne regualtor AGAIN too... man, 3 reg's in less than a year trying to get the right one, then it is defective!!