Won't start after truck was running great then went to restart 2 hrs later

What is your question?

Had fuel pumps replaced month ago, checked fuses all good, but how can I check the relays? Truck ran fine then shut down for 2 hrs and won't stay on, it tries to turn over but it just dies

What makes this problem better or worse?

It's been cold out, and had new iac motor is called month ago

How long has your 2000 Ford F-150 had this problem?

Just last night one time