since i've had my car I've always used 89. my wife put 87 octane in my car
and almost immediately my gauges went hay wire. While driving all the gauges would spin at the same time, the check engine light would come on, the car would sputter but it would not cut off. So I've continued to us 87 in her to make sure we had no problems but every now and then the same thing would happen but the car wouldn't cut off.
Should I go back to 89 and if so how long should I wait? I do have a code for the knock sensor, should I replace this asap.
any help would be appreciated.