Boost oscillations and down on power

First off, hi all it's my first post on here.



I have a 2006 335i auto.



I bought the car a year ago, it was completely stock. Within a month I took it down to evolve and had it mapped it made 379 bhp and 415 lbs/ft. For the first day the car ran well and felt fast on the second day the car felt sluggish and not like it was. Called evolve and explained the situation they told me to bring the car back and they would have a look and change some coding in the ecu.

Got there at 9am and didn't leave till 5pm. In that time they tried to load various different maps and ech time the car would just crank and not start it would only start and run with the stock bin loaded! In the end they refunded my money and sent me on my way. They said they had never experienced this before and cannot help me. To say I was gutted was an understatement.



Since then I have fitted a jb4 g5 ISO and a dci. Again car ran great for about a month this time then back to its old tricks and down on power, shortly after that It started getting bad boost oscillations but only in 3rd and 4th gear when going WOT from 3000 rpm upwards the car literally feels like it kangaroos! If I go WOT from 2000rpm then I get no boost oscillations but it still feels down on power.

So then I put vrsf DP on and and active autowerk fmic and a forge cp with forge 50mm BOV then loaded a custom backend flash. None of that helped the issues. So I replaced the turbos all vac lines put RB PCV valve in and replaced both boost solenoids. Still the same issues.



I am literally at my wits end with this thing it's turning my hair grey!



Has anyone experienced these issues?



Any help would be appreciated