I am running into another issue with my engine after resolving my previous

I have a random misfire code and the condition seems to start when coolant temps reached 158 degrees F.

On cold start up, it is fine and idles fine. As soon as it reach the 158 temp, it starts to become erratic at idle.

Wideband sensors looks to be working fine, and my MAFs also, both sides are even in voltage.

I am idling up to the 160 mark when I start to backout of my driveway.
From there to about 210 is when on accelerating slowly.
210 to 230 is on deceleration going down a hill, off throttle, in gear.
250 and on is when i'm idling.



Double checked each cylinder has the correct ignition wire connector
New spark plugs
Swapped injectors from bank 1 to bank 2

 

Spoke with Eugene, and he's sending me a tune. The scaling on my o2 sensor might have been off.

 

Coming back to update my problem. Surprisingly, this issue was cause by my 75mm TB. As soon as I switch back to my 70mm TB, it idles smooth past 158 F coolant temp.

 

I was going to comment that this sounds, tune or electrical. Sadly many 75mm folks are hitting this drivability issue as well. Great to know you found the issue.