Hello everyone, I just purchased a 2003 vtx 1800c. It has 11,000 miles on it. It has Vance and Hines pipes, power commander, k&n filter and housing. When I purchased it the battery was dead but started up and ran perfectly with a jump pack. I hauled it to a Napa and got a battery put it in and it fired up and ran like a top. But after a few miles it’s started sputtering when I throttled it up to fast. Then it started running really rough and stalling, and back firing, not wanting to start and when it did it wouldn’t idle with out some help. The guy I bought it from said it was only stored for a couple months and he treated the gas before putting it away in heated garage. I am new to vtx’s was wondering if anybody had any ideas. I pulled the intake and fuel rail, checked all the connectors. The rail and injectors seemed clean as a whistle. I am going to replace the spark plugs tomorrow and see if that helps.