88 ram help

Guys I need help diagnosing my 88 ram 5.2 fuel injection throttle body. The truck has 53000 miles. I bought it used and it has had a problem at steady throttle and light throttle. It pulsates at light throttle. Give it more gas and it clears up.When you first take off it acts like it wants to stall but give it me gas and clears up. I've done egr and fuel injection cleaner and fiel filter.Plugs wires cap were all replaced when I got it. Now it has started getting worse like it is cutting out. My manual says vacum leak,idle passage plugged. I can't find any vacum leaks. Any help would be apprecited. The truck did sit for a while if that helps. Mike
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