I own a 1991. 4x4 6cylinder. I cant figure out what is wrong with it. Please HELP! I start it up and let is run for a few minutes. The put it in drive. When I gas, its almost as f its starving. Like its going to die. Then its as if it just kicks in and is fine. Then when I am driving and slow down at all or stop to speed up is a joke. Like it cant pull its own weight. Ive changed plugs, wires, fuel pump, filters, starter blah blah blah . the tank and lines are clean. i dont know what else to look for or who to ask. My last guess would be bad valve. but i was hoping its not. please help me!!!!!
Thera