Audi 100 2.2 - Poor running when hot?

[Retrorides]

Hi All,

I am suffering issues with my 1987 Audi 100CD 2.2 Saloon. When I bought it the car had not been used for 10 years and so it was treated to a fuel tank drain, removal, fuel pump replacement, new fuel lines and fuel filter amongst brakes etc for the MOT.

The result now is the Audi is fine when cold and runs well but as soon as it gets warm it suffers from hestitant running and stalling. Swicth it off and turn on and it will go again a few feet but leave until cold and the problem has gone??

I have replaced the new fuel pump with yet another new fuel pump and bypassed the accumulator but still the tank pump is buzzing despite having half a tank of fuel (although it only buzzes when warm)

In additon it has had a full service with new leads, distributor and rotor, plugs, air filter another fuel filter, camb belt and vacum hoses?

I am running out of things to try now? If you have any ideas or can recommend someone who can look at the injector pump it would be appreciated? I am new to Audi's and always remember these when I was growing up and love it when it runs well.

Hopefully someone can help?

Thanks