[uxdesigner]

I had a similar issue a year after I had my truck running with no issues. Gave it some thought... stumble at startup = no fuel in lines. I checked my gas tank vent line and it dropped down from where I had originally placed it. Realized it was level or just below level and with the fuel sloshing around it had some fuel in the line that was causing a vacuum / clog. Cleared it out, moved the line back up and resolved the startup stutter, make sure your vent is clear.