Hi everyone, long time follower of the forum,
this is my first post.
Owner since 4 years of a .1 GT3, 40k miles, no engine mods, no over revs, complete service history.
Two weeks ago I replaced the battery,
then I connected the Durametric in order to reset the various error codes.
While connected with Durametric I started to log some engine values, and noticed misfire on cil.1 and 3 when the car is at idle.
The misfire counter stop to increase as soon as I start to rev the engine above 1100rpm or driving the car.

It looks strange to me.
Anyway no CEL or error code recorded about misfire.

 

Coils. And how old are your sparkplugs, maybe change them as well.

 

Sparkplugs replaced last spring, 5k miles done.

 

These cars are lumpy at idle. Misfires not uncommon. Log the car under power pulls 2-3 3k+ RPM and monitor. If that looks OK I would not sweat it. Of course, check your plugs/coils are current.

 

Thanks for the reply, I will try to replace the coils and check the sparkplugs.