Everytime it get damp outside or rains alot, my Silverado runs ith a miss or is very hard to start...We had a warm moist day recently and the truck ran fine the day before went to start the next day would nt start at all.. Replaced plugs wires and starter and still the same thing..Check the spark and it was good so i pour a small amount of gas down the throttlebody and still made no difference... Could this be the crank sensor ?