2G Lean and bogs at high rpm

[gst-turbo]

Car started being lean at idle and will be at around 15.5-9 and at cruising it at 14.7-15.2-3. And if I go around 4000 rpm or higher it will jerking up and down. Things that I have checked are spark plug gap 0.28 and new wires. Boost leak test to 22 psi and I done it around 5 times this month. I tried testing coil pack but multimeter is not stable will read then go down and I don't know if it's normal. What should my next set be to fix the problem. I can post a log if u need one thanks

 

[Dsmkauai]

What wideband are you using? What fuel and injectors are in it? Have you done a blt since the problem started?

 

[gst-turbo]

I'm on 91 and it's and aem wideband. It's on stock 450cc injectors and the problem started a month ago and I done 5 Blt since and I did one this morning also.

 

[gst-turbo]

I been playing around with the spark plug gap and it has fixed my stuttering problem but I still have that lean idle

 

[boostdawd]

Under the min octane table in ecmlink where do u have the aft set at?

 

[gst-turbo]

Aft are 100% stock at moment

 

[simplejoe]

Are you getting enough fuel? Do you have a afpr with gauge, what's it reading? If spark is ok, then I'd be looking at fuel pressure.

 

[gst-turbo]

Fuel reads 43 psi at idle. How would I check for spark and i tried checking coil pack but I was not very successfull