S-10 Problem NEED HELP PLEASE

I have a 99 manual S-10 (69k miles), never had a problem... Recently after driving any distance and coming to a stop the truck doesn't seem to get enough gas to move forward. Almost like I had the emergency brake on. If I turn the car off and then on it runs fine. Checked the fluids... my last oil change it was too cold to do myself so I got it done at a place where they said they checked all the fluids... well needless to say the coolant was very VERY low... filled it back up but I am still having the same problem and now the Check engine light is on... I think maybe I lost a vacuum in the radiator or the fuel pump is acting up... Need some help, please...

I think I am going to flush the radiator and replace the thermometer (perhaps it was damaged due to the low level). If that doesn't work I will have to replace the O2 sensor. Anybody have any advice or comment on that chosen path?

You might want to replace the fuel filter, and/or air filter.
It's probably worth a try. Just my opinion.

You didn't say which engine you have but the 2.2L is very prone to eating/blowing the head gasket. It may not show up in the exhaust as you would expect but the coolant level goes down a little every time you drive it. If it gets down too low you warp the head and it is even harder to keep the gasket in there. Fill up the cooling system and run it. Keep checking it. If you do it right you can do it right from the overflow bottle because when it cools down it should always be at the same level. If it goes down in the coolant bottle and does not show up on the driveway you are burning it. Check your water pump too. Mine was leaking for a while before I caught it. By the way I went thru 3 head gaskets in 278,000 miles before the engine wore out. I got pretty quick at changing them!!