Engine light comes on and goes off same day/ every other day.

What is your question?

2006 mazda mx5, 50,000 miles. Engine light came on 2 weeks ago. Checked code and it comes up with the knock sensor, wiring, and ecm. Wiring is too new to have any problems and there shouldn't be anything wrong with the ecm or a different code would come up for that. Tried locating the knock sensor and I can't find it. Like I said, the engine light comes on and goes off same day or every other day. Also, I've been having some hesitation in power when applying the throttle going into 4th gear. Scott

What makes this problem better or worse?

Nothing

How long has your 2006 Mazda MX-5 Miata had this problem?

2 weeks on and off