TruBluRookie

I have a '93 Chevy Silverado 5.7 V8. Because of where I live it was -20 for a few days. I jumped my truck and drove it around to make sure the battery was strong and would start fine if we got more snow. I let the truck idle for too long and when I tried to drive away it stalled and took a bit to restart. After starting it I pushed too much on the gas it would cut out and act like it was going to stall again until I let off. A few days go by and now it idles rough and still acts like its going to cut out when I give it too much gas and also backfires if I give it too much gas. I'm hoping this isn't a huge expense. Any ideas?