Citroen dispatch 1200 hdi lwb - possible fuel injector

[Razzle]

Just a quick one to see if anyone knows what's wrong with my van.

It starts fine, no nocks or strange noises just sounds right but once you start to put power through it I.e. Drive it it looses power and starts to smoke really bad from engine bay and rear (not sure if it's coming from exhaust or underneath at the back). It also misfires slightly.

Anyway if you stop it it drips diesel? Could this be a injector problem and the engine is forcing diesel outside onto the exhaust etc which causes the smoke as there is no oil leaking or water etc just a diesel drip which stops after a long rest.

If anyone has any idea please let me know as i don't think it is a very serious issue or it wouldn't start perfect and sound fine or would it?

Thanks for all help