Most likely not the problem but your Hand Primer is obviously "on the way out".

Since the problem is happening about the time the Turbo kicks in I would check/clean the banjo bolt in manifold and vacuum switchover valve on bulkhead again.

If you have an EGR on your Car you night try disconnecting and plugging off the Vacuum line and see if itthat changes anything.

__________________
84 300D, 82 Volvo 244Gl Diesel