I have a 1992 ranger that seems to be bogging and almost cutting out at a WOT and at a heavy load whie trying to go up a hill. I have to barely tap the gas to get it to go up a hill, if not it will stall or just bog really bad. Ithink it might be overheating cause it is extremely hot, but i dont believe the temp guage is working,c ause it doesnt show it running hot. What could be the problem here?

 

Tune-up all new filters, wires, and plugs, with injector cleaner (professional).