intermintant starting

I have a 1996 chevy pick-up 4x4 5.7 with 105,000 on it. I am having trouble with it starting. Some days it will start fine and other days it will just sit there and turn over and not fire. I replace the fuel pump last year, my fuel pump relay this year and my EGR valve. It seem to run and start fine when its nice out but when its been raining or high humity thats when it seems to act up. Does anyone have any suggestions.
O and by the way no check engine light

You might want to try here. They deal with your year truck and may have an answer for you!!! Good Luck.

http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=1453

Yes wrong forum, but i did not find it posted over there yet so i figured i would offer some insight here. Having starting problems under damp conditions like that would most likely be the distributer cap, replace the cap and rotor. My dad own a 93 and has had the same problem twice and it was the distrubuter cap that had a small crack in it and was letting moisture in but the crack could not be seen it was that small. Change the cap and rotor and it will most likely fix the problem.