Odd sputtering and rough idle Options

[Malek]

I know the 3SGTEs are notorious for destroying distributor caps and rotors and plugs, etc. but from what I read on here and other forums about this issue doesn't seem to quite match up to my issue.

Symptoms:
-Cold start: idles high normally
-Once warm: idles rough (misfire) and fluctuates 750 - 1000 rpm
-When driving: Major hesitation up to about 3k. Sounds of misfire.
-Above 3k at steady throttle, seems to run fine
-When giving good amount of throttle, doesn't pass 5-7psi and replicates video (below)
-Wideband reads 15ish when above is happening

A comment in the video said they changed their spark plug wires on their GST and it went away..however, this Evo is boosting pass 20psi and I can't get past 7..


Evo 8 Boost


Any suggestions before I jump into dizzy, wires, plugs..? Thanks!

[Malek]

Art, that is the most comprehensive check list I've seen through all of my searching!

Before I did anything this morning, I took it out for a drive. It started and idled fine. I let it warm up for about 30 seconds and drove it (I know you're supposed to let it warm up longer). Anyways, in it's cold state, it boosted normally to 13psi and AFRs were normal.

It started it's sputtering issue when it was warm. AFR reads high 14-15 when I try and step on the gas. This tells me it might have something to do with fuel.

I just replaced the fuel filter. The old one was nasty inside but it did not change anything.