I have a 2002 GT 4.6L . Sometimes it will idle rough and sometime on take off it will miss or hesitate , also when cruising and accelerate . I put new plugs but didn't help. any ideas thanks
have you tried about 3 months worth of fuel injector cleaner? mine was doing all that except the backfires. also any check engine lights on? if you have disconnected the battery which I guess you did with plugs...try disconnecting the battery for 15 mins then going on a nice 30 min joy ride to reset computers fuel management.