Maybe carburetor icing. A rare thing , but I’ve had it happen. High humidity and just the right temperature.
The frosty ice just melts away afterward.

Last edited by Steelonsteel; 11/29/2023 5:44 PM.
~Charley
1954 Chevy 3100 with 235
“Bud”
Follow along in the DITY
1963 Chevy half ton stepside short box 230
1954 GMC 3 ton 302
And several more Chevy camper and work trucks 1979 1987 1996