[thornbird33]

OK THIS IS THE PROBLEM I'VE GOT A 1988 RANGER WITH 5.0 H.O. AND IT IS BACKFIRING THROUGH THE EXHAUST UNDER HARD ACCELERATION ANYONE HAVE ANY SUGESTIONS?
THANKS

 

[Outlaw Ram]

Most likely its an air diverter valve.

 

[da roadreaper]

HAVE YOU CHECKED THE TIMING? IT MIGHT HAVE SLIPPED ON YOU ESPECIALLY IF YOU WORK THE ENGINE HARD