It has been nice enough to ride my motorcycle to work so I haven't been using my truck as much. After my C1500 sits for a day or two it is becoming harder to start. The battery is good and the started is good. I have the 5.7l with 120k on it. I just replaced the fuel filter and added some fuel injector cleaner, per auto zone recommendation. This has had no effect. The thing is I can crank and crank it is trying but just won't start. I have pulled the air filter off and gave a quick blast of carb cleaner and that baby fires right up. this has ne to believe it is fuel related. Even if I just turn the key (not try to start) to let the fuel pump "prime" it makes no difference. I am stumped. Any thoughts?