If not that , check the wiring around the distributor, may be an intermittent short not enough to blow the fuse. my bronco 2 would sputter when first put in reverse, it was the fuel pump wire shorting behind the alternator. i didn't find it until it finally blew the fuse(too bad i was away from home at 1:30 a.m.)oh well,I found out why i got it cheap.mike