wont start

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I have a 98 2wd blazer with a 4.3 v6 vortec motor if it sits more than a day it wont start and if it rains it wont start ive changed the fuel pump ,plug wires and plugs and the distributor cap and rotor button and the ignition coil what else could be causing this to do that and it is gettin terrible gas milage. It missies out real bad till it warms up then it is fine. It starts fine if you start it everyday and drive it.