Running after key off??

I am getting my car back on the road after installing a new oil pan, transmission cooler with fan (no relay) and a new steering box. While the steering column was out, it was rotated several times and it rotated freely. Would that mess up any grounding issues? I of course had to unplug the harnesses and reinserted them. The column is grounded. Electrically speaking, I did wire up a fan, Removed and installed my distributor, unplugged the steering column, wired a transmission temperature gauge, installed a new holley digital dash.

How do I track down why the car keeps running until the fuel pressure drops for the Holley Sniper EFI. Maybe a couple seconds at most.