Hey guys recently did the DOHC ZC swap in my 89 CRX SI.....throwing a code 4 which is the crank angle??.....i dunno how to get rid of this thing....the ecu im running is an PM-6 out of an 91 SI also got the PG-7 but still throwing that damn code #4.....the motor won't let me rev past 3.5 rpms.....help me please....thank you and have a nice day!!!