1998 P30 Chevy 454 - Stalling at interstate speeds

Thank you all for the quick responses.

The shop we stopped at did check the fuel filter. He could blow through it but since he had it off, we just replaced it as well. They mentioned that it may be the fuel pump starting to go. At the time they tested it, the pressure was in range.

Unfortunately the pumps aren't stocked anywhere local so it will take a few days to get in. We will start unpacking

1995brave - I will check the air filter and also have the shop check the vacuum lines.

Thank you