Scotties

When coming up to a situation that requires me to slow right down or stop, with my right foot on the brake (i.e. no throttle) and clutch depressed, the revs drop right down and the engine stalls. Idling speed at rest is fine, it's only happening when I slow down from speed. A quick turn of the key and it fires up again immediately, but is annoying and embarassing! Any ideas chaps? I have read somewhere there is a specific ECU reset procedure to be carried out after diconnecting the battery - could this be my problem, and if so, what is the procedure?

'84 VR6