Bought my first harley from an out of state. It is an 09 heritage softail. Had a miss at low end. Like when you first roll on the throttle. Other than that it seems to run fine. Took it to local dealer for a Dyno tune. Dealer says specs are all over the charts. He found a bad throttle body seal but that did not fix. This bike has a screamin eagle stage4 103 race kit in it. The dealer says he thinks the heads and intake are too big for a 103 motor(58mm throttlebody and 2 1/8" valves). He feels we need to change out the heads and intake. This could cost $2,500. He did point out that the dealer that did this build used stock head gaskets instead of screamin eagle head gaskets which are alot thinner. Could the thickness of the head gaskets be the cause of my problems? Looks like what seemed a good deal is going to turn into a money pit.