I drive a 1993 Chevrolet Lumina 3.1L 6cyl flex fuel (I have all that in the wrong order, but I don't remember what order they go in. :/ sorry.)

We were having a stalling issue with the vehicle and I was told to change the spark plugs. Now that the plugs are changed, I'm having an issue where the car is not accelerating, like a loss of power. It drove alright other than stalling before I changed the plugs. I'm due to go on a long trip this coming weekend and would love any ideas of what I can do to fix the problem. We have 3 mechanics in the area and none of them can take it until after the 21st. :/