Alright so ive got a 95 accord coupe MT f22b1 four banger and i got big drops in my idling, it will just drop and go up and drop again and so on.... mostly from 1800rpm or so to 1000ish, it almost always happens when im in neutral, im about to replace the intake air temp sensor so i dont know if it will help or not(engine light for that sensor)

Anything can help!! Thank you for reading

 

Fix anything that comes up with an error code, then reset the ECU to see if the problem goes away.

Air in the coolant and dirty/stuck idle control valve and fast idle thermo valve can cause idle problems.