Just got HPtuners my 04' redline already has an e85 tune on it problem is I can't get e85 where I'm at and been driving with premium for a minute now and having serious issues. Plan is to clean the intake and s/c replace gaskets. Clean all the sensors and then put in the appropriate tune. All I really need to do is adjust for the different fuel and for the car that I removed. Should I adjust the current tune or scrap it? I'm kinda lost where to start with the time.