98 C2500, 7.4/4l80e.
Belonged to a neighbor who just let it sit and sit and sit.
5 gallons of heavily doctored Chevron Supreme (Heet, Seafoam and Lucas fuel treatment), and a new battery, it started righ up, and made it home.
Almost new Michelin's from my 87 V20, and it was rolling well. Changed all the fluids, new belt and hoses, filters everywhere, and a MAF, and it's running pretty good. It gets better with every tank with Techron Fuel System additive.