67 350 w/ powerglide.
Last summer, the engine was missing on ~3 cylinders and required new plug wires and a carb rebuild. Everything worked great for the next 500 miles. Put the car away for the winter.
Got the car out this past weekend. Fired right up. Let idle in the driveway for around 15 minutes. Then went on a short ride. Drove perfect for around 5 miles. Stopped and shopped. Came back out and took off. Went another 2 miles and then the engine had a complete melt-down. Felt like half the engine stopped firing. It wanted to die. Fortunately, I was going to a gas station at the time. Didn't quite make it when the engine died. Coasted into the station.
When I tried to start it, the starter would turn, but it didn't sound or feel like it was cranking the engine. It was weird.
So, I had it towed to the shop. That was Sunday afternoon. Monday, when the shop opened, there apparently was no issue. Started and ran fine. They ran it periodically throughout the day and could detect nothing. Everything was dialed in good. The carb was clean and free from gunk. Fuel and air were flowing fine.
I picked it up and drove it home. Handled like a dream. Happy to have a $0.00 issue, but not real confident in the car right now.
So, what happened? I think I had stabilized fuel in the tank, but let's assume that I didn't. Could some chunk of crap broken free and clogged a line or cylinder for a while ... and then get shaken and pumped through the system during the course of trying to start it and/or being towed across town?
Should I be freaking out ... waiting for it to die again, or should I feel confident that what I experienced was a one-time-only artifact of the first drive of the year after having sat for 5 months?