I had an issue fitting a 70mm throttle body on my b18c, need to adjust the iac duty cycle to keep the revs stable. Mine was worse though, turn car on and it revs to 4k and idle hunts between 2.5-3.5k revs. You could have the throttle slightly open during idle aswell, cable might be to tight. I reverted back to stock throttle body in meantime till i get hondata, to adjust my duty cycle.
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