It could be air getting in to the dieselpump a small leak in the dieselpump.
Iff not it could also be the timing is wrong, didd you changed the glow plugs?
Always bay bosch glow plugs or ngk but bosch are preffered.
I hade some brake flued in the dieseltank and itt runs much better now, the problem is with diesel injector clean bottle it can dry out the injectors/dieselpump and then there is less friction in the camber, dieselpump.
What you can do is use diesel injector clean and after that trow in some 2 takts oil.
It should run smooth but hey best is off course clean the injectors while taking it out.
I have seen some treads how to clean injectors also on youtube a peugeot 306.
So good luck and have a nice day.
Iff not it could also be the timing is wrong, didd you changed the glow plugs?
Always bay bosch glow plugs or ngk but bosch are preffered.
I hade some brake flued in the dieseltank and itt runs much better now, the problem is with diesel injector clean bottle it can dry out the injectors/dieselpump and then there is less friction in the camber, dieselpump.
What you can do is use diesel injector clean and after that trow in some 2 takts oil.
It should run smooth but hey best is off course clean the injectors while taking it out.
I have seen some treads how to clean injectors also on youtube a peugeot 306.
So good luck and have a nice day.