[72gmcworker]

Water in the gas???????

It will collect in the in carb filter preventing fuel from getting through the filter starving the carb. and causing all sorts of hicups, poor idling, etc as you mentioned ...also when the water gets into the carb.
been there recently.
Pull the filter and drain it for signs of water.
And/Or drain the tank completly and start over with fresh fuel and fresh filters..again