Baz is it running OK now ?? When you disconnect the battery it does take a while for the
ECU to adjust again. The best thing I have found is to take it for a half hour run on the freeway (in my case the M5) and this usually sorts it out and everything will be back to normal.
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Owning a Cougar is like owning a Super Model
Good to own but "High Maintenance"
2000 Model Eibach Cougar (Auto) - Now dead & buried