Need help diagnosing my LT1 ( San Diego)

[El Super Kevbot]

Im having ignition problems. Its just running rough. It been starting and driving fine, no major problems, just rough, down on power, and misses up top. I got new Delco wires and plugs ready to go in and a new coil and fuel filter. After that, I don't want to throw any more money at guesses.

If you have an obd1 scanner, that would help out too. Anyone kind enough to help a brutha out?

Thanks guys.