Hello, any help would be apprciated. My sons truck died on the road. I first replaced fuel filter, then distributer cap and rotor,replaced spark plugs and wires, and new coil. tested ignition module (good). put in a new distributer and walah, it started right up. I believe it ended up being the pick-up coil. althouh the gear was shot at the bottom of the distributor. Ok started great, but timming is my next issue. I pull the plug on the wires by the ignition module. set to 10. runs ok, then when I put the plug back, it tries to fine tune itself and starts backfiring. did this a number of times and am stumped. smells of fuel like its running rich. Has plenty of pressure at the inline valve by the regulator. there are no warning lights on. plz help.thank you.