2010 challenger RT, 6 speed, only mod is SOLO mach X exhaust.. 4500 miles, and had the P0300 Cylinder misfire code 2 times now. ones at about 2000 miles and now at 4500. car is not driven hard. anyone else seeing this problem? had it to the dealer 2 times and they cant come up w/ a reason for it. they have a call in to DODGE Tech Line and they are supposed to get back w/ dealer in the morning. Does anyone have a fix for it? the 1st time i had it in for this problem, they just cleared the code and it ran fine for about 1500 miles.