AC Delco CPS or parts store CPS?

Parts store CPS are usually bad right out of the box.

AC Delco CPS that I got from the dealership. I bought one from the parts store that was a BMD I think and that was bad right out of the box, then I replaced it with the AC Delco and cleared the codes and it run perfect for 5-10 minutes the first time then started running horrible. Orriginally when I changed the CPS it was running fine and I was driving it all over that day but the check engine light came on saying it was a code from the CPS so I just changed it thinking i'd avoid any further troubles with it, but since then its not helped.

It could very well be a problem with the fuel solenoid or it might just be a bad connection to it?

I'll take a look at the connections on the pump, anywhere else I should look for bad connections?