first post here.. i just recently purchased a 1990 crx si with a gsr swap from HMO. it runs good pretty quick but sometimes it throws a knock sensor code? today it threw it when i was in 4th getting up to highway speeds about 4k and when i was headed home i pulled it out in 2nd gear and then put the clutch in and let the rpms fall and it threw it again? the previous owner told me its a jdm block and they dont have a knock sensor? it has a p72 with hondata s300 v2 running jdm gsr base map. also throwing a code 13. b18c skunk2 intake and throttle body A1 trans stock manifold/header. i also have a high idle problem when i got the car it idled at 1500 put new o rings in the map and the iat and it was around 900 and every day i drive it it seems to get a little higher now its at 1500 again? and a small 100rpm surge have it set at 500 in hondata here is a video of it running..