Volvo S60 2001 idle problems

[Hemmav]

Hey guys
I have a Volvo S60 2.4T 2001 and I’ve been fixing that car Since last year, I’ve change coils and spark plugs due to missfire check engine light, the intake pipe was broken so I replaced it too, I changed output and input transmission sensors, I changed gasoline filter and also I’ve changed the throttle body and Maf due to having idling problems and that the trhottle body didn’t respond when I pressed the pedal...

Well now I still have the problem with the difference that now the throttle body responds but like with high impulses, I can start the car by cranking and giving some gas and the rpms can go so high but gets down and up all crazy and the engine cant stay on without pressing the pedal... please of help, I’m so done with that, I’ve spent a lot of money and now Idk what to do... no check engine light anymore

[EngineeringBloke]

I see you replaced your throttle body. 2000 and 2001 S60s had throttle position sensors that used electrically resistive tracks. As they aged, parts of the resistive material would get worn away and the engine control computer would not be able to determine the throttle position. However, with a new throttle body that should be ok. Did you replace the throttle body yourself?

The high reving suggests to me extra fuel, with air being added to balance the air fuel mix. Perhaps the fuel pressure sensor is sending an inaccurate reading.

You might also have an intake air leak. Did you ensure all the intake air piping was correctly sealed with the clamps? Worth rechecking.

There may be a stored code even with no check engine light. If you are driving the car, you can check it out at an autoparts store to have the codes read.