vwt3

Hi all! I have a 1984 VW T3 (vanagon, T25) with an ej22 swap. There has always been this niggling issue with it occasionally cutting out immediately after coming off the throttle. It idles smoothly and runs well otherwise. There is no real effort to keep running, the revs just drop to zero after coming off the throttle and the dash lights come on. It starts up straight away afterwards. Any help is appreciated! Thanks.