Have something rather odd going on with my engine all of a sudden tonight. Cruising very easy tonight going home through the neighborhood trying to keep quiet and notice the tone of the engine changed and felt like something was dragging the car. Did it a few times and started to look at the AFR on my NGK and everytime it happened the AFR pegged max lean.

Seems like if this is happening, an injector isn't firing fuel into the cylinder which is really concerning. Need to try and figure out what cylinder this is and in what conditions this occurs.

Anyone ever come up with any helpful histo for analysis of injector operation?