Engine dips...

Well, I just picked up a 2nd teg, my new toy, to keep me busy during the winter blahs. It’s a Silver 93 LS. I bought it gutted and intend to work it up until I’m satisfied.
I have a small, yet important issue with the engine. After I fire it up it idles for a bit, but then the engine dips in speed and regains it seconds later. This is patterned too, dipping then regaining and so on. Engine light appears 5 or so mintues into a drive depending on how hard i drive it.
A buddy of mine had a similar problem with his teg and it related to his pistons i believe. I’m gonna change up the plugs, but i doubt that’s the least of my worries.
Any feedback would be appreciated.

Does anyone have any insight into this? Experience maybe? I’m thinking it might have to do with the computer or with my intake. Any suggestions?

idle - http://www.g2ic.com/forums/showthread.php?t=42969&highlight=bad+idle+troubleshooting

checking codes - http://www.g2ic.com/tegtips/engine/13.html