My 98 Ford Ranger's radiator cap stopped sealing the other day. It ran hot and started backfiring while I was trying to make it home. After I let it sit long enough for it to cool, I figured out that it was the cap not sealing, so I replaced it.
Once I cranked it back up after putting more coolant in it, it still ran awful, spitting and sputtering and had very little power. Going down the road it wouldn't get over 30 MPH, still backfiring. I checked my plugs and changed the one fouled-out plug. I used blue devils head gasket sealer. I took it for a drive after the 50 mins and it's running a lot better but still backfiring. It's running kinda badly. What should I do? I'm stumped. I need some advice.