We had carb. Problems and replaced the carb. Ran good for awhile but then had problems of it starting sometimes and sometimes wouldn't. So now we have replaced the spark plugs, wires, battery, starter, new dist.cap,coil,rotar,module,pickup coil and a new ignition switch that lays on top of the steering column. There's power going to the dist. And the truck turns over but will not start ! We are just baffled and frustrated. What else can we do to get this truck started? Thank you for your help. Debbie