I have an '89 Ranger 2wd 2300 Pinto motor ( thats what I like to call them as I have dealt with them since the days of Pintos) It has a dual plug head which at the moment is only running on one side. I found some of the postings in here quite interesting as many people are saying that the plugs on the exhaust side fire on the exhaust stroke and that is the side mine is running on. According to that my truck shouldn't be running at all.