Ok I think I know whats wrong with my 93 4.0 2wd ranger but I wanted to check befor I droped 80$. My Ranger always runs bad when I start it, sometimes dies. But once it gets going it fine. But the problem always comes back at the same paces on the highway every single time. I drive about 20 miles to work and in the middle of or RIGHT after I go up or over a big hill it just looses all power. I have to pull over to let everyone by, I sit there for a while and after about 45 secs of idle or somethimes after restarting it will let me get on the gas with out learching. When it loose's all power and just wont rev up I notice if I put it in neutral it will rev up fast as you want it to, soon as you put it back in drive it just bogs down.