has anyone used the crower 401 or skunk2 stage 1 cams on their stock ECU? just curious since i have a motor with 401s on a p72 and every now and again it throws a code po170 and po172 which is rich and trim malfunction. this only happens at idle or right after the car is started warm. is the duration increase enough to do this? stock late model ITR cams measure 243/235@1mm and the 401s are 249/240@1mm right now i'm in the process of getting the idle under control. it seems to be getting better as the motor breaks in. i've tried the usual fixes. just curious if any of you guys have ran into this.