Welcome! The first thing you must do is change the fuel filter. When they plug, they cause all kinds of random symptoms.
We make our annual trip across the mountains to Hendersonville usually on New Year's to see my in-laws.
Had my Sub 6.2 for 14 years or so - 303k miles currently on the original engine. It ain't the fastest but it is usually dependable and sure.
Mark Chapman DP member #653;
1983 K2500 6.2 Suburban, 4" lift, 35" tires, ATS turbo, Banks exhaust/intake, pyrometer, tachometer;
1986 K5 6.2 Blazer, 2" lift, 33" tires, Banks intake, pyrometer, tachometer
1963 wife, one owner, average mileage for the age but in excellent shape, a keeper
1992 daughter, low mileage, pretty, limited edition, but requires some money to maintain
1995 son, sports model, very fast & peppy, time will tell on durability and maintenance costs
"Grease is good"