car sounds and runs horrible

[97rs]

my car is running really crappy. it started when i ran the straight pipe w/out an o2 sim for 50 miles. it is extremely loud and vibrates and the ses light flashes unless i am idling. i put the o2 simulator in almost 40 miles ago and it is still running the same. when i am idling my oil pressure drops to about 45, but goes back to normal when i give it gas. i could possibly have an exhaust leak at the y pipe, could this be it?

[98Camaro3.8]

Check the SES light. I believe flashing SES means missfires. Have the code scanned to see what's going on.

[97rs]

i found the problem. a spark plug was partly melted from rubbing on the exhaust manifold and it was sparking against the exhaust where the wires were exposed from the melting. so i wrapped tape around it and it runs alot smoother now, but its still a little rough i assume b/c of the partly burned wire.

[Guardsman]

Double check and make sure that you don't have any wires on the wrong cylinders.