WHAT WOULD BE THE CAUSE? MY TRUCK IDLES FINE IN GEAR IT MISSES BACKFIRES W2DIE?

CK YOUR TIMING, FUEL PRESSURE AND PLUG WIRES TO START

Sorry I've been trunk to change me answer. No it had the problem. On drive him after I paid for it. It showed them signs. Top radiator hose collapsed. I've done my fuel fillter,spark plugs. I'm about to do my tos??