petermoore wrote:I know exactly what it is. The carbs just need balanceing properly. It had me stumped the 1st time I came across this problem. If I remember correctly on the top of the left hand (as your looking at the engine from the back of the van) carb there is a balancing screw have a play with this until both carbs are sucking the same amount of air. then take your van on the same run. keep tweeking it until the problem goes away.

hi taken photo of what i think you mean , theres just a little screw , think its called byepass ideling screw , is this the one on the left . ???? THE OTHER one doesnt have a screw , cheers