S. term fuel trim vs. misfire question, how does it relate?

[joejoe3]

I'm having some misfiring issues under cruise conditions. It's random misfire, and sometimes involve cylinder #1,2,3,4 as well.

I did some reasearch on the board, so how does S. Term fuel trim play an effect on misfiring under load (*during cruise)?

I see that you can fix these lean misfires by adding fuel, but at what conditions do you know it's time to add fuel?

[Spunkster]

You should be looking at the lambda readings and tuning your AF accordingly. If you get misfires from running too lean, add fuel to the needed areas.

[joejoe3]

So I should do a cruise datalog and then use lambda overlay to increase fuel where the blocks suggest?