I have a 91 cvic stick shift and when it is having trouble accelarating when I shift to 2nd reving really high and a little but in 3rd but it is fine at medium to fast speeds. I think I need some transmission fluid but I am not sure. What could it be?

Have AutoZone test the igniter and coil for free. There's a real possibility the igniter is bad. It's easy to check the manual transmission fluid level. MTF should be changed every 2 years.