[dhspring]

My son's starting problem hasn't totally gone away on his 2000 Silverado, 5.3 liter V-8. We replaced the fuel pump and fuel filter and have 55 psi at the check port. It still doesn't start like it used to. We used to be able to turn the key without hitting the gas pedal adn it would fire right up and idle at about 700 rpm, now you have to pump and crank and kind of work to start it. When warm it might crank right up or not. I checked the plugs they look fine, there is 78000 miles on the truck. The check engine light does not come on, I checked for codes, none come up with an engine analyzer. So something is still amiss but it is subtle. The truck drives normal on the road with normal acceleration, no missing or anything, it's just at startup where the problem it.

Has anyone else had this problem or any ideas? Thanks very much!