Ecu Fault ??

[TURTS]

Hi I'm a new member with a problem.I went to start my Focus Estate 1.6 lx petrol 05 reg the key just turned in the ignition no clicking noise.All lights came on dash then went off leaving red cog looking light on and engine management light on.After 30 mins try again and it started bu t same 2 lights on.Ive since disconnected battery and reconnected but fault still there so on Saturday took it to garage to have diagnostic test they said there were at least 50 fault codes so he reset ECU.I drove it home and it ran like a dream,great I thought,but then on Saturday night it was same fault left car till Sunday and it started 1st time while driving Sunday I stopped at lights and up popped the red cog light so got her home forgot to say it has a power delay when this all happens garage man said miss fire.Monday started and ran ok.Whats going off any ideas guys. PS sorry for long post.