I was told they just break, but i am curious if they can short out from time to time?  

They absolutely can have a mind of there own. I have 6" 130w Hella lights behind my grill, on a relay of coarse. I was doing a night job in a doctors office and around 1 am some one was flashing there light toward the office. We all just figured it was a couple of kids screwing in the parking lot. Then the lights stayed on from about 2 until 7am when I found out it was my car flashing the lights. Luckily I have 2 batteries so the car started just fine, but the fog light wouldn't turn off until I pulled out the relay.

So yes they can short out from time to time, even when they are not bouncing around  

Thats cool,I just thought they might break. i will try a new relay for my problem and if not then ill just go for the fuel pump next lol. Thanks for the help.  

Darn no luck. Replaced relay and it still backfires in idle so next thing is fuel pump lol.  

I fail to see any possible way a relay can lead to a backfire.

Or an under-producing fuel pump for that matter.