Main relay

So I replaced my main relay a couple of days ago cause i was having starting problems with my 92 accord. The car started up fine with the new one in and ran nice and smooth for the first day. The next day I decided to get a little crazy and gun the s.o.b. as soon as I did that the check engine light came on and the car just stoped. It started up fine again and cut out again as I was pulling into my driveway. It now does this everytime I drive the thing. ??????????????????????? Did I get a faulty Main Relay? Did I fry something?
Any help would be useful.

Thanx