95 mustang gt Running kinda need help

Just got the 95 mustang running found out my firing order isn't the HO but the no-HO Firing order , anyways got the timing set to 10 deg and went to check my codes now I know I have EGR codes cause last owner Botched the EGR Stuff so I put a EGR Plate on and the Exhaust plugs in Heads. But I got 2 codes one is a ,10 - Cylinder #1 Failed Cylinder Balance Test The other is a, 212 - Loss of IDM (Ignition Diagnostic Monitor) input to EEC or SPOUT circuit grounded. I have checked compression in cyl. 1 and its good,also i moved spark plug and wire to another cyl. to see if code changed to that cyl. and it didn't, I also checked for 12v on injector and Pulse also i heard the injector ticking like it should. So im confused as to what is causing this, I havent really worried about the 212 code yet. Any Ideas?

I also want to note that I am unsure of the motor thats in it because the firing order is for a non HO. m guessing someone replaced the factory HO with this older NON HO, and i do not know if they replaced the ECU or not. Im going to get the code off the ECU and see if i can get info on that ECU.

Thanks you jozsefsz I will start checking the Spout wires first. I did not relize that the 212 code cauld actually cause the Cylinder balance test to fail . Any idea where to start with that 212 Code

Anyway of testing for a failed pickup or just replace the whole distributor.