Recently bought an 2011 DJ with the 3.6 and has 44,000 miles. Check engine light just came on, got it scanned, its the #2 cylinder misfiring, so most likely needs new head. Me and the wife have a road trip to Myrtle Beach this weekend (we live in Indy). I know theres no way this is getting fixed before the trip, so my question is will this cause serious issues while on the highway or is it just an occassional misfire that wont have any serious effects until going unchecked for thousands of miles? Also, might there be a valve cleaning fuel addative that will help? bout to start seriously panicking if we cant drive this thing to vacation!!!!