u/OwO-Bika

Hi everyone,
I have a 2002 Skoda Octavia MK1 with the 1.9 TDI ALH engine (66 kW). Recently I replaced all the old cracked rubber vacuum hoses with silicone ones because they were brittle and one already had a hole. I replaced them one by one very carefully, no lines were mixed up.
Background: The reason I changed them is that the car previously went into limp mode due to the broken hoses. My dad temporarily put back one critical line (I think the Y-splitter that goes to the N239 ASV or the check valve) and the car pulled extremely strong again.
A while ago I also noticed the car started acting weird after a pull

(Turbo is very fresh only one year old, and ive been taking care or the car, almost always driving 55km not short distances)

Current problems:

1. Boost issue
   • Cold engine: Almost no boost at all until ~2100 RPM. On OBD I see only -0.07 to -0.03 bar.
   • As the engine warms up, boost gets better but still delayed.
   • When fully warm:
   • Light throttle → some base boost from ~1600 RPM
   • Floored → real boost only comes after ~2400 RPM
   • After 3000 RPM it finally reaches 1.00 – 1.15 bar
   • Vacuum reading: around -0.99 inHg

2. Jerking / shaking I also replaced the lower dogbone engine mount because it was worn and loose. The car felt great for the first 2 days after the mount change.
   Since the vacuum hoses were replaced (about 1 week ago), the car now when i turn it off it shuts off roughly

What we already checked:
• Removed the intercooler pipe on the EGR → inside was golden with minimal gunk, slight smoke came out, and it was dripping a tiny bit of oil.
• Unplugged MAF → almost no difference in behaviour.
• Cleaned the MAF sensor with petrol → no real improvement.
• Tested the ASV (N239) → it sucks in about 1 cm when I turn odf the engine, and AI said it should stay like that for a good 3seconds it just stays like that for 1maybe nit even that much

For now i will be cleaning the EGR with cleaner eith my dad and the intercooler, dad said maybe it collected some oil too

What should i check out? or anyone has an idead whats happening

so i have a mk1 skoda octavia 2002, 1.9tdi 66kw alh

and ive been switching to silicone vacuum tubes cause the rubber ones were giving out, my turbo not charging just from 2100 rpm and the breaks are weird sometimes

and now somehow its even worse after switching could somebody help if the lines are connected correctly