Fuel pump?
We had a GMC Jimmy, great vehicle until it started costing us in suspension parts. Last straw was a fuel pump (and/or fuel filter). Symptoms were sluggish on the throttle (thought for a while is was the tranny) and eventually it wouldn’t start. Not sure if this helps, but good luck.
I second the fuel pump or maybe a clogged fuel filter. You maybe bought bad gas at a place you normally don’t go to?