It goes like this, the initial dancing rpm, (fluctuating)
Rust in the fuel system
Dead or weak fuel pump
A dirty throtle body
a malfunctioning TPS sensor in the throttle body.
Plugs (dirty/or may be unspecified)
If all the above is okay, maybe some of the valves of the engine are choked due to excessive carbon deposits.
As if all of the above is okay, theres no point ur car should be behaving abnormaly. Plus theres no check light either.
An Airfilter should not at all be responsible as it doesnt matters alot in Petrol driven cars.
Do you know where are the injectors located?
can u unplug them one by one as u did with the coils (plug wires test)
U can perform a injectors test similarly by unpluging all the injectors one by one, if the car doesnt dies by unpluging any of the injectors that injector might be dead or not geting proper current.
If it dies then the Injectors are working a-okay.
What do Honda people say to ur cars problem btw?