Hey guys, this is my first post here. I've been searching for some insight on a problem I've been having and this forum looked well informed so here goes. I have a 96 K1500 with the 5.7 Vortec engine. The trucks been sitting for a few days and out of the blue when I tried to start it I'm getting nothing but sputtering. It tries to fire but never actually catches. I've pulled the plugs and I'm getting spark, I've peered into the intake manifold through the throttle body and theres a little bit of pooling so it's getting fuel, plus the plugs were damp when I pulled them out. I checked the DTC's and theres nothing. The interesting part is the fuel pressure. With key on engine off I'm seeing about 62psi which is in range. When I crank it, I'm seeing mid 50s and a lot of flutter on the gauge (I'm not sure if the flutter is normal +or-5psi). The fuel pump makes the normal sound when I hit the key, but every few cycles of key on engine off the pump seems to stop about a second early and the pressure drops all the way to 0 almost instantly. However, when the pump runs its allotted time, the pressure remains at 62. The majority of what I'm hearing is that most likely its the fuel pump check valve. Does this sound correct? The pump is also only 1 year old. Thanks in advance.