I have been troubleshooting the air intake and replaced all the vacuum lines to the turbo, Air mass Meter, TCV, even the whole intake between Air MM and Turbo, and still car cannot go over 4000 rpm, it starts to loose power, as of right now I am suspecting Fuel filter and Fuel Pressure Pulse Damper, as the car starts to pulsate after I rev the engine, (along with the cabin lights, and sometimes shuts off) 170 000 miles,Xemodex TB 1 year ago, any ideas or advice will be appreciated,
Regards,

Alex
1989 760 IRS sedan B230FT, 1990 780 Bertone B230FT, 1990 760 Wagon B230FT;
2001 V70 2.4T ; 2004 XC90 2.5T, 1970 144 B20A,
2004 S60 2.5T parts car
Previously owned: 1999 C70 convertible HPT, 1987 740 GLE, 1976 Citroen CX Palace Diesel,
1986 Peugeot 205 GT 1.4, 1992 Peugeot 309 1.1

Prior to this:
Replaced the MAF sensor with BOSCH original (was 0280218045, I got 0280218108 from FCP), changed the radiator ( it had a hair line crack under top hose) hooked up Vida and it came up with ECM-6806 turbocharger(TC) control system flow fault, at the same time got ecm-280A front heated oxygen sensor bank 1 - Signal too high, I did reset the codes ones more with Vida, but the symptoms are still there- I am thinking the O2 sensor is ok, it is just the mixture triggering it, will look for TC control valve and hoses (silicone as of right now)

and:( before MAF sensor replacement)
I did let it run for a while- it died after 5 minutes- never happened before. Restarted and was watching the Tach- the dome lights are flickering, idle is very unstable, ( Xemodex TB installed 1 year ago) when I push the gas pedal- it will go up to 4000 rpm and that will be it, it will loose power and will not continue. It will run at higher Rpms, but without much power, Recent CEL was P1171, which was cleaned just before the suspected Transmission problem begun, MAF Sensor was cleaned a year ago, but something tells me the MAF is the source of all this, since the P1171 has been coming of and on ever since that
And now the strange thing is that there is not a CEL present- I last reset it with ELM 327,