hey needed your guys help.my car starts up at 1500rpm when cold but when it warms up im about at 900rpm.but after awhile of driving my rpm would shoot down to 100 rpm very low like it would die but its still running.im am throwing a code for knock sensor would this cause the problem?after it warms up and i drive it engine light comes up for knock sensor.motor seems very healthy stock pr3 ecu vtec cracks like its supposed too

 

how about fixing the knock sensor problem? come back if it still does it