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What do you mean by "running flat" up till 3500 rpms?
You mean you have no power and can only rev up to 3500 rpms?
Could be a few things:
1.Your CAT is toast time for a new one.
2.Your Engine is toast time for a new one.
3.Check your coils and replace them along with spark plugs.
1.To check your CAT, you might want to dealer to do that. They will have to replace it under emissions laws.
2.Lack of power is when your 8 goes into limp mode due to bad apex seal(s). IE: blown apex seal(s).
3.Sometimes bad coils and or spark plugs will not allow the car to idle or rev past a certain point with out throwing a CEL light or flashing it on your HUD.
RPM and speed do not match what I'd expect to see at 120. but that could be gear ratio being different than I'd expect. Most don't like to run at 4k. Most problems at that rpm is either plugs (experiment with different gap settings or change heat range one step colder or hotter) or can be coil related (work fine except when recovery time is shortened due to rpm). However, the weird noise may be due to a partially plugged catalytic converter. So, check that as well. If you have a knock sensor, test that too.
firstly remove the inlet fuel line at the filter and and blow down line with a compressor ,removing fuel cap first,if this doesnt work then it could be fuel pump pressure of air flow meter ,but iam often wrong with this sort of thing and it turns out to be the radio,all joking aside try blowing out fuelline doesnt work??then take it to dealer for computer check
Sounds like you need to replace the MAF sensor its the unit on toyota vehicles that calulates how much Air intake is going into the throttle body and then sends a signal to the ECU of your car which adjusts your Fuel injector compensation. When your MAF Sensor is malfunctioning it will throw the fuel curves out of wack and cause your car to what mechanics call "lean out" or "running rich" its basically your getting too little or too much fuel at higher RPM's and the motor is choking from too much fuel and not enough air. Hope this helps let me know if it doesnt so i can continue to troubleshoot for you via internet