Kangarooing when foot off gas

[markydidler]

T25 1988 1.9 DG. Help req I feel I have tried everything. When I take my foot off gas at low speed the van kangaroos, bucks similar if you where pulling to stop and still in top gear.
Never used to be like this. Van starts well from cold, idle is fine cold and hot and runs well when foot on gas.
I have changed plugs, leads dizzy cap and rotor, Ignition coil, swapped carb ( pierburg 2e3 )
Adjusted mixture, idle and timing. Check for air leaks. All vacuum pipes renewed, air filter renewed. Stripped carb and cleaned out, Must be something else I can try, any help appreciated
Thanks

[Ads1987]

Not something a bit more random like a weak fuel pump or slightly blocked fuel filter?

I had a similar issue which was a sticky accelerator plunger on the carb but that's unlikely since you swapped it already.