i just got done installing a obd1 h22a in my 97 civic with a obd2 to obd1 conversion harness on p13 ecu, and when i started it up the rpm just start to climb up to 4000 rpm and stays there. now, i checked my throttle cable and there's still slack on them. what else could be causing this. pls. i need help and any advice would be helpful. thanks in advance.