Before i start i want to say that i have looked at the surging idle checklist, and performed most of the items I believe to apply. So I have a 94 GT, cobra upper and lower, 24lb injectors, 24lb cobra MAF, adjustable regulator, 255lph fuel pump, BBK equal length shorties, bassani x-pipe and mufflers, MAC Cold air, a SCT chip with a Brenspeed tune, Smog pump delete with pulley. After we installed everything but the x-pipe and mufflers and cold air i lost the computer, when i replaced the computer it ran good for a few months then it started to not want to idle down to correct idle speed at about 8-900 RPM. Also when i push in the clutch between 2-3000 RPM it revs up about 500RPM and then slowly idles down. It doesnt do any of this until the temp needle moves, the second it moves the slightest it will start having a poor idle. When i replaced the computer i was sure to match it with the correct T4MO for my car so i know i have the correct one. I have replaced the IAC, TPS, and cleaned my MAF, I have also tried putting a MAF that i know to be in good working order on my car and still no change. I have also checked multiple times for vacuum leaks using carb cleaner while the motor is running. Yesterday i pulled codes and got 511, 10, and 157, with the KOEO, with the KOER i got a CYL 8 and a 111. I know that 511 means Read Only memory test failure, but im not sure exactly what that means. I could not find 10 on my sheet, and 157 was Manifold Air Flow sensor low voltage. Im assuming that is the mass air? which puzzles me because i already checked it. I dont know what the CYL 8 Means either, and the 111 means system pass. So im stumped here, i would appreciate anyones advice, and im willing to try anything at this point.