I have a 85 100 that I am restoring. And I have had similar problems in the past. This is what fixed mine. I suggest doing all of these things in this order to ensure quality mechanics and more enjoyment out of these great trucks.
1)make sure all of your cardurator screws are tight this will create a vacume leak.
2)use carb cleaner spray on the inside and outside to remove gum and varnish helps to free linkage and cleans the jets.
3)adjust air flow screw passenger side black cylindar. Turn it to the right til it closes. Then turn it back left 1to2 full turns. Do the same with the idle cam driver side behind the air flow sensor. This will be a spring screw that is hooked on the throttle body. Set till it hits the cam then back it off 1to 1.5 turns from plum. May have to pull back on the throttle and move the cam down by hand to get the screw to set on it before backing it out
4)change air filter
5)change fuel filter
6)change spark plugs, those new wires caps and rotar do nothing for you if your plugs are bad, plus this will aid in starting your truck and gas milage
1, 2, 3, 6 are the most important in my opinion. These are all things I did and my truck runs like a top you may have to adjust carbwith the climate and my setting may vary to yours do to location, I live in indiana. Good luck kris
Sunday, January 22nd, 2006 AT 10:35 PM