1.4 stalling on idle.

My `88 340 (1.4 28,000 mls) has just started refusing to idle when restarted after a run and brief park up. (Usually fine from cold, but I don`t usually drive it - my wife says it`s fine in the mornings)It will only run on the choke and stalls whenever I take my foot of the gas.

My first thought was the idle solenoid and I have cleaned this and it seems to clunk on and off quite nicely when 12v supplied. It did not help though it still does it every now and then. Removing the lead however does replicate the symptoms however suggesting it`s not right.

I`ll change it for a spare in the morning but in the meantime has anybody any other suggestions as to what might be causing this problem. Any thing else I should be checking?

Hoses appear fine on brief inspection and all the carb bits and pieces are nice and snug.