Looking for anyone selling tires for a 1991 Ford 250 with size tires of 235/85/16. Looking for four total. Thank you.

1991 Ford F-250 5.0L. Stalling/Surging problem when temperatures are under 35-40 degrees with engine cold while idling. Will stall when temperatures are a little colder. Once engine is warmed up, idles great. Idles great with engine cold during spring/summer/fall when temps are warmer even...