2002 silverado with 4.3 L will not start. Earlier it would not start whenever it rained. It has got progressive worse to the point that it will not start at all. In the past year I have installed new fuel pump and fuel filter. It ran for a while until it rained then nothing. Recently changed distributor cap, rotor, coil and opened vent in distributor housing. At that point the engine would start, but would not go much above an idle. start to die. let up on fuel and in most cases it would return to idle. Installed new plugs and wires. No change. Took off ignition control module and had it tested. Tested good. Re install ignition module. no Change started the vehicle each day for three days to see if fuel pressure was being maintained. it started but no change, would not take fuel above idle. On the fourth day, would not start. fifth day would not start. Tried spraying ether down the throttle body and reconnect air induction to rule out any problems with Mass air flow sensor. Will not start. Several attempts with air induction on and off will not start. Anyone have any ideas? I'm fresh out! Thanks in advance.