I\'m pissed at the truck!! I just got the '85 K30 back today after getting new plugs, wires, and a freshly rebuilt carb put on. The timing had been set and carb tuned to where it ran pretty good. All that ran good for the first part of the evening. Later, around a couple hours later, the damn thing starts popping again. Just a little bit of popping now and then. Also has a lack of power when accelerating at a certain speed. Before the rebuilt carb went on, I had the Edelbrock carb tuned and the truck ran fine, too. Just when I drove it a little more and longer, it popped again. So I had a different carb rebuilt and the popping came back tonight. What the hell is going on here? With two fairly new or rebuilt carbs, something is not right here. The timing is set. Plugs and wires are all new. I'm beginning to wonder if the camshaft maybe has some flat lobes? Keep in mind, right after the work had been done to the truck, it ran fine and smooth. Just after awhile the popping came back, on both carbs. /forums/images/icons/mad.gif HELP ME OUT HERE!!! This is my daily driver now. /forums/images/icons/frown.gif Any ideas?