Have changed the plugs, wires distributer cap and rotor
Assuming you do not have bad valves, rings, etc (which means you should perform a compression check), I would be suspicious of clogged fuel injectors. To clean them out, go to the auto parts store and buy _2_ bottles (Note: the _large_ bottle, regardless of your fuel capacity) of ''Chevron'' brand Fuel Injector cleaner. It is the _only_ brand that contains a chemical called ''Techron.'' It really works, although for first time use it takes a couple of tank fulls to clear out the injectors; which is why I'm saying ''buy 2 of them''. Wait for your gas tank to need filling, and pour in a full (large size) bottle _before_ filling up with gas. I'd recommend using Premium gas (just for this clean-out procedure). Drive the truck until it is down _below_ 1/4 tank. Then pour in the other bottle, and fill again with Premium gas. Then drive again until near empty. At about 1/2 empty tank, during the second ''clean-out'' (on the second bottle), go on the Interstate and ''open it up.'' You don't have to speed. Simply nail the accelerator at about 20-30 mph, and lay off it when you reach the speed limit. Then slow down again, and repeat. (This is actually _very_ important to do to flush out those injectors, but wait until the second treatment to do it, and be safe about it... no speeding, and don't do it in heavy traffic). NOTE: _Never_ ''nail-it'' from a dead stop. That will damage drive train components. Get up to 20-30mph and _then_ ''nail it.''
_If_ the problem is the injectors, this _will_ work.
Best of luck...
-Gregg
Missing can be from vacuum leaks, faulty injectors , low fuel pressure, faulty coil, ignition module, low voltage from faulty alternator or bad battery supplying less than required voltage to the electrical system
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