My 2000 Maxima with 69000 miles has a tendency to ping solidly through moderate acceleration. Taking off from a stop is fine but when it shifts to 2nd, unless I am punching is hard, it pings solidly through the acceleration cycle.
I use nothing but 93 Octane from any of Shell, Mobile or Sams with the same results.
I had a coil pack changed at about 52000 miles to relieve a check engine light. The engine temperature is right on the money.
Any ideas??