when i get on it at about 12lbs boost it knocks, the advance does down to 21 from 37. what else doi look for, couldit be the 87 chip im running? also using the 87 maf & ecm.
Check to see if the fuel pressure is rising with boost I'm having the same issue so for now I'm staying out of boost. This issue started with mine I found out my injector harness was faulty at #2 after getting a new one its not as bad but still exists I'm gonna get a new coil and module to see if that helps but monitoring fuel pressure is key under boost to make sure it's where it should be. Keep us posted if you figure it out let us know what it was
