the biggest cause of bad gas is sitting idle for more than 2 months with whats in gas it only takes one month to start to degrade at 2 months of just sitting the gas has lost alot of octane and doesnt burn as well, the second is filling your van with a gas can this can cause 2 problems water and filter plugging dirt, if your suspecting water in the gas use "dri gas" sparingly as the ethanol that is now present in all gas is basically "dri gas" are you sure its a bad gas situation and not a bad sensor?
GMC vans are sometimes advertised for sale on Gumtree of Craigslist and should be relatively cheap. You should also check out local car dealerships, and Auto Trader where used GMC vans may be advertised.
You could have a clogged fuel line, bad gas or some other kind of problem, definitely with fuel.
GMC, Chevy and Ford each make a great line of cargo vans. These vans are built strong and made to last.
Chevy Astro and GMC Safari
Some of the C6500/C7500 Chevrolet/GMC trucks are LPG powered. The W series Chevrolet and GMC trucks, and the ones built on one ton cargo vans, are either gas or diesel powered.
Voltage surge? Bad relay? Bad switch? Bad ground?
Cracked distributor cap or bad plug wires
The 2011 GMC Terrain is a gas-powered vehicle.
The 2001 GMC Yukon is a gas-powered vehicle.
The 2007 GMC Canyon is a gas-powered vehicle.
The 2010 GMC Canyon is a gas-powered vehicle.
The 2003 GMC Yukon is a gas-powered vehicle.