Hello all. I have been troubleshooting a problem with my mostly stock 93 5.0 for a couple of months now and am highly frustrated. I just cannot find the problem. Car: 93 For Mustang 5.0 V8 - 170k Miles - Mostly Stock Original Engine - Block/Heads/Intakes (upper/lower) Original Exhaust Original EEC Primary Problem: Timing does not advance at idle or while revving up the engine. SPOUT in or out does nothing. EEC Codes: KOEO: Code 11 (o,c) - system OK KOER: Code 18 (r) - SPOUT circuit open The Check Engine Light is NOT on. EEC Cylinder Balance Test - 90 - system OK ============= Aftermarket Engine related mods before the problem showed up: Upgraded alternator Additional alternator wire - alternator to battery Upgraded ground wire - battery to engine Dual Electric Fans and Fan activation Thermostat Upgraded water pump Upgraded Radiator ============= All of the above upgrades were performed 6 months+ before I noticed the problem. After the problem showed up I started troubleshooting and decided I would go ahead with some planned upgrades and maybe get lucky with resolving the problem at the same time. (I was wrong ) ============= Aftermarket Engine related mods after the problem appeared: New Idle Air Bypass (IAB) New Throttle Body New EGR Plate New Cold Air Intake New Throttle Position Sensor (set at .95) New MSD Coil New MSD Distributor, including new PIP (timing set at 12 degrees) New TFI (came with Distributor) New NKG spark plugs New MSD spark plug wires New vacuum hoses New PCV ============= Other troubleshooting: EEC connector pin 36 to ground = infinite resistance EEC connector pin 36 to TFI pin 2, SPOUT in = less than .6 of resistance EEC connector pin 4 to TFI pin 5 = 22k resistance TFI pin 5 to Coil negative = less than .5 of resistance Unscrewed both EEC grounds, sanded, cleaned, and remounted I bought new O2 sensors but could not for the life of me get the old ones out even using an O2 wrench so I returned them. I plan on installing a new exhaust next year so I'll replace them then since the EEC showed no codes referencing the O2 sensors. ============= Secondary problem: (this may be related to the primary problem) From a cold start, the engine idles fine for about 2 minutes then starts to surge while idling until the engine eventually dies. If I adjust the manual idle screw by about 1/4th of a turn to increase the base idle ~200-300 RPMs then the idle stabilizes. ============= Any help would be appreciated.