driving me crazy
i have an 87 ranger 2.3 I recently had the head remanufactured and now have it put back together. the truck runs great most of the time, but skips occasionally. when it does, a little bit of black smoke comes out of the tail pipe. i have replaced the cat converter, fuel filter, plugs, wires, and added a bottle of drygas to the fuel. it was worse, but i advanced the distributor, until it finally started to idle right, but when i shoot it, the mark is at like 30 degreed past the tc mark, almost to the btc mark. could this be a worn out timing belt, or maybe a fuel pump? i do not have the tools or money to spend trying to diagnose the problem, so any tips would be helpful.