Have a silverado that has problem starting/ gets worse as temp. outside gets lower. During warm weather 1st start of day might take 3 - 5 cranks. When temp. is around 40-45, it might take around 15 cranks to start. After it starts the 1st time & gets to operating temp. it has noproblem starting after that. Right now temp outside is around 20 degrees. i cant get it started at all. Tried spraying gas down the throttle body. Acted like it wanted to start, but, didnt quite get there. tells me its a fuel problem?? Any ideas? Thanks ahead of time!!