My car has lost power? HELP?

I was showing my car off like an idiot and I was revving it up. It is a 1993 Mazda Protege LX with the 1.8 liter DOHC I-4. It redlines pretty high(7400ish). I revved it up and it made a loud pop. Now it doesn't seem to have the power it used to. I'm not sure what it could be. Some help would be nice thanks.