Well here I go again. Changed throttle body to one I know that worked. Changed fuel filter, and also put in a new base gasket. Truck still bogs and bucks until it hits about 40 and then it smoothen's out. Checked for vacuum leaks at throttle body and all over engine, and found none. Changed wires, cap rotor and plugs also. Distributor has no slop in it.
Could the timing chain have jumped a tooth causing this low speed roughness? I am puzzled, any other ideas?
Thanks
