Engine has been fine last 20k or so miles. Left it for about 6 weeks, not driven. Battery was flat. Started and it now sort of pulses and hunts, very regular, when cold, kind of vrrooom, vrrooom, vrrooom, regular at about 2 second intervals. Stops once car is warmed to operating temp. Black smokes a bit when sationary and revved whilst cold. Seems to be running too rich. Any ideas what could be causing this. Sensor somewhere?. I have a reasonable knowledge of cars and engines but do not know how VR6 cold enrichment works.
On Corrado forum someone said that the ECU needs to 'learn engine a