21k

a few problems are hard start ups when cold. i start her up and it will constantly stuble until i hit the gas, bad idling all the time, vtec doesnt engage at 6k or will engage then vtec stops working but it will still go up to 9k but really shitty cause its out of vtec.

im thinking sparkplugs???
injectors???
valve adjustment???

btw, this all started happening after the instullation of my aem v2 coldair.
really apreciate any help. im gonna replace the plugs with ngk iridiums, and put some injector cleaner in with my next fill up. i also hear a kind of knocking noise coming from the engineand it gets faster as i rev it up but i dont think its pre detonation cause i dont hear it pask 2.5k rpm. no cel lights ever.