4age 16v running roughly - diagnostics shows unknown code

[Ryo]

Hello,
I would like to ask for your help as i am currently experiencing some issue with my AE86 and i was still not able to locate it. Maybe someone had already this issue and will point me in the right direction to solve it. I already mentioned the diagnostic error code but after it was cleared the engine still not running as it should be.
Actual sympthoms are that the car idles roughly and i was not able to locate the issue it warms up normally and the rough idle is all the way from cold to warm engine. The rpm from cold to warm engine goes normal. If i hit the accelerator it does not hesitate it responds quickly and by 2000 rpm i hear some knocking noise from top of the engine than after it goes above that rpm the sound vanishes and the engine idle stabilise and all seems running well from that point.
First time i noticed something wrong was after i was driving on highway at normal speed about 110km/h by overtaking some card i notices some weird sound from the engine for short time by accelerating. After i finished my 150km long journey and entered the city i noticed that from the light stop when i accelerated that by 2000rpm engine was making weird knocking noise. At higher rpm was everything normal. When i parked the car i noticed the idle is not normal.
The other day i went to test again and the idle was not correct still this noise by 2000rpm.
I spend whole day analyzing but did not come to some solution what can be wrong. Weird is that it warms normally it response normally on throttle. No overheating, Oil pressure is normal. Oil level between H-L markings. No significant Fuel consumption. Engine is not smoking. No oil losses. Engine coolant levels normal.
The engine is unmodified 4age 16v with AFM, catalytic converter and O2 sensor. It has now around 195 000km on the clock
What i already done was:
Checked spark plugs – all looked well still tried different set but no change.
Verified spark plugs wires tried different set but no change.
Checked distributor cap and rotor but all seems to be okay.
Inspected injectors sounds and cleaned all injectors and verified thay spray the fuel normally.
Diagnostics was first showing something wrong with MAP sensor and IAT sensor so i tried different AFM but no difference in idle only now there is no error from ECU.
Verified timing and timing belt all is correct.
The car starts normally without hesitation.