Troubleshooting
Hello!
1995 Z-28, K&N, Borla, otherwise stock.
Distributor, wires, and plugs replaced in last 18 months.
Slowly (over a couple months) developed a higher and higher idle. Now when warm, idle will "stick" at 2K+, suddenly drop to normal, then climb back up OR SES light comes on. Codes EGR, 44...