I was driving today ( my first day to get my 98 Z28) and the SES light came on. I reset the PCM and it went off. I went back out later that night and it came on again, and then it went off and now it is currently back on. What should i do to get it off and make sure my car is running fine???

 

I forgot to add that it's a 1998 Z28 A4 with LM exhaust and a lid.

 

Your not giving any useful information, many reasons MIL light can get triggered.
You need a PCM scanner and see what the DTC error codes are to know for sure what the problems are.

Most times a flashing MIL that goes away means engine misfire or multi misfire would cause light to stay on longer but again that is a guess.

Also any time you clear out DTC error codes you also forced ALL I/M 240 smog tests to revert back to a non complete (failed state) and force the PCM to do more work by retesting them all and in some cases could take as many as 40 drive cycles to get back to a passed/complete stay thus it is better to let the DTC age out and leave the tests in their present completed state.

 

It has 68k miles on the stock plugs. Could it be the plugs and wires?

 

I think Autozone can read that code for you for no charge. You will get to the bottom of it pretty quick once you know what that is.