I just changed the spark plugs, added oil, and transmission fluid to my car but it is still doing the same thing. We drive the car and now it does not go pass 20. Give it a lot of gas and it hesitates

You should really have the error codes read if the check engine light is on. The parts that usually cause a condition like that aren't cheap. Could be a bad MAF sensor or a bad Crankshaft position sensor. I wouldn't start throwing money into expensive parts unless you get it narrowed down. You can start by doing the most inexpensive things first. Buy some throttle body cleaner. Remove throttle body and completely dismantle and clean. Do the same with your IAC (idle air control valve). Check all vac lines for leaks. May improve your cars issue. If not, get codes read and replace needed parts. Autozone will read the codes for you. Here is a quick video on cleaning the IAC valve: https://www.youtube.com/watch?v=G-mwd5VJKt8 You can also mist some water from a spray bottle on your plug wires, cap, and coil. If you hear any snapping, or a change in idle, that will quickly tell you that there's an issue. Just a couple of easy inexpensive things to do before spending any real money.

Went to auto zone and we have an emissions leak. We no exactly where it is at so we are gonna fix that.

My brother is gonna check it later Cruz too many friends keep telling us the wrong thing. U have told us exactly wat we did already. That's really good. But if we fix the problem and it keeps doing the same thing then we will check all the filters and carburetor.

Test your Crank Position Sensor. It's located in the distributor. I would say it's probably your issue. Your brother will need a multi-meter. Here is the test procedure. I hope the pic comes out in this post. There is a test procedure • Disconnect the 8pin connector from the distributor • Measure the resistance between sensor terminals B & F (ECU terminals B15 BLU/GRN wire & B16 BLU/YEL wire) • If the resistance is not between 350Ω & 700Ω replace the distributor. • If the resistance is between 350Ω & 700Ω - Check for continuity to body ground on both B & F terminals. • Does continuity exist Yes - replace distributor No • Test the ECU