Help, my 2007 rxp has 36 hours and ran great last summer.  After sitting up for the winter I changed the oil, filter, and plugs and took it out for a run.  It appears to have a very slow start out of the hole with limited top end.  Last summer it would run 65 mph ++.  In an attempt to fix it I replaced the fuel filter and did seem to fix it.  Run great at idle and all rpms.  Max RPM currently are 6500 -6800.  What should I check next?  Dealer says its the supercharger!  I don't have any fault codes.
				
			
	

