This might be one of those "since yous". Since I had to replace a bad ignition coil, I also replaced the ignition module, dist. cap and rotor, wires and plugs. Set the timing to 0 deg TDC as prescribed,but the truck stalls when shifted to Drive or Rev. Tried advancing the timing slightly, but no help. It has never done this before and I think I may have disturbed something to cause this. Also noticed a chattering of the injectors that I do not believe was there before. inspected vacuum lines, but saw nothing apparent. Any Ideas?