Shudder Problem, and kind of a MAF Problem

[fado1986]

Hi, Im kind of a nob to diesel engines, and Im having some problems with my Vento (Jetta) 98.
From one day to the other, it have become very hard to start, when I decelerate the engine shudder and sometimes when I accelerate, it sometimes stays stuck at 2000 rpm, and it had lost power. Im using Biodiesel 100, it hasent been 5000 miles since I changed the diesel filter.
I have check the IQ, and I use the hammer metod and VAG and theres no way I could make it lower than 6.9. I have check the MAF and it didnt give a lecture over 800 (the max was 738 @ 2793 RPM).
The MAP readings are OK, I have clean the air filter, and there are some carbon deposits in the EGR but not that much. Also I have some oil leak in the CCV, and I notice oil in the intake pipes.
Any help will be highly apreciated...
Thanks

[chittychittybangbang]

No injection quantity adjuster codes? It's strange that you cannot make it lower than 6.9 w/hammer method. Are you loosening the right bolts and can confirm that it moves?

No boost leak?

[fado1986]

Im sure about the bolts, the IP cover is at the end of the round eye of the security bolt. And the boost seems to be OK, cause the MAP values are very close to each other (1795.2 spec 1927.8 actual @2961 RPM).
Thanks

[chittychittybangbang]

Bolts circled in blue?

[fado1986]

Those exact ones, I used the guide found in this page to make the adjustments