Intermittent Engine Check light comes on .
Vehicle did not stop but almost stalled on a few occasions.

After about 45 minutes the vehicle started to sound a bit strange and felt as if it was going to stall, had to keep the accelerator pedal moving at lights. After about 3 minutes the ECM light came up on dash and then after about 5 minutes it went out.
After that it ran OK until the next time it was driven for about an hour and the ECM light came back on.