1998 Chevy Metro having issues

The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone or Advanced auto parts in your area, they will read them for free. Once you have these code numbers, we can be a lot more specific about what your problem may be.

i took it to auto zone and they said
1. bad o2 sensor
2. bad caytalytic converter
3. engine misfiring
4. vacuum issue
this is all i know

I need the exact code numbers, not their interpretation of them.

P0420

That is an emissions code for catalyst efficiency. It rarely has any effect on engine performance and likely has nothing to do with any of your dirveability issues.

well how do i fix that then?

90% of the time it's replace the catalytic converter but you have other problems.