I RECENTLY SWAPPED INTAKES FROM ONE CIVIC SI TO ANOTHER THEY ARE BOTH 91 AND THE NEW ONE SEEMS TO IDOL AROUND 4200 AND I CANT SEEM TO GET IT DOWN DOES ANYBODY KNOW WHAT THE PROBLEM COULD BE WE HAVE CHECKED FOR VAC LEAKS AND EVERYTHIGN SEEMS FINE WHAT ELSE COULD IT BE PLEASE HELP THANKS