Just purchased 2016 Allegro Bay V10 gas. RV has been sitting for a long time, very low mileage. Check engine light on, took it to a Ford dealer and they said it was a misfire on two cylinders, blamed...
Did they tell you what the OBD codes were showing? Some aut parts stores will read codes for you. Could be bad coil packs if that is code. Bad gas will not set a code. Get some fuel system cleaner such as Lucas or Chevron Techrolene(sp). Put enough in for your size of fuel tank. I would overdose somewhat for first time, but don't get carried away.