When you removed intake manifold to service the PCV system...you needed to disconnect TPS(Throttle Position Sensor) connector to be able to remove the manifold. Did you re-connect it after putting the manifold back? Maf sensor connector almost always make problems at this age. Plug it in and out a f...

Some codes needs time to be set...the others are instant....depends of which dtc is stored and which sensor is at fault.

To cut this agony...read the codes and we will see what is going on.

Read the codes from both...Engine ecu(A2) and ignition ecu(A6)...since your car have them separately.

Unplugging IAC valve should kill the engine instantly...unless throttle cable is binding and keeps the throttle opened.

If both mentioned are ok ...then you have a large vacuum leak somewhere in the intake.

U.S market don't have 10v cars. Dtc you have is telling you that fuel mixture is too weak....could be lack of fuel or lack of air. However...when there is LPG system fitted...it's harder to diagnose the problem because there is too much splicing into original wiring loom which will corrupt proper si...

www.volvospeed.com is your friend on this journey.
There is a lot of tuned Volvos and they will show you the right path.

There is a good mechanic in Croatia who knows these cars pretty good.
If i remember correctly his name is Nenad from Jaska,Croatia.
You might try to contact him on www.vkh.hr

Vol-fcr works only with win XP.

You need an old laptop with serial(db9)to obdII cable...or to install xp emulator on win10 since you have usb to obdII cable.

I was about to mention a MAF but cam sensor open circuit put me on hold to re-consider it. You can drive with maf disconnected...but not for long since it will run pretty rich and it will foul o2 sensors and spark plugs. When ordering a MAF make sure you buy oem Bosch 0 280 217 107...nothing else wi...

They are the same part # for n/a(M4.4) & turbo up to '99(ME7).
Bosch 0 280 217 107.