ok my 1990 3.0 is running like it wants me to take it to the yard but i cant let her down i love her. it has a lack uf power and it has a tendency to bogg down if you put the gas pedal about half way down. if you barely get on it and if you put all the way to the floor it is fine. i have aready changed out everything i could think of and i am at a hault right now. i dont know if it is the oversized tires. do you think that 32x15.50 super swamper tsl's are to heavy for the truck. help me please i dont want go get a chevy while i put it in the shop and let the mechanics run my bill up. any help would be appreciated.