2011 Ford Ranger Sport, 4.0 with 105,000 miles started running rough coming down exit ramp. Felt like brakes were failing while engine was knocking. Stopped immediately and checked all fluids (as just had an oil change and fluids topped last week). Everything under hood looked fine (but still noise). This was first trip out after oil change. We drove about 100 miles today with no issues. Engine still knocking and drove 5 more miles to auto parts store to have them run codes. Code P0301 (cylinder 1 misfire) and P0420 (catalyst system efficiency below threshold). Auto parts store thought we just needed spark plug. Drove the remaining 3 miles home when all kinds of noises and truck engine quit (battery light came on at that time). Presently, engine will not turn over. HELP!