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!

[lagos]

Update:

Changed the spark plugs.

All better.

SN: I didn't bother changing any of the ignition stuff for the swap because I figured it'd last me to the summer when the engine would be taken out again anyways haha apparently not!

Ignition components normally last a while under normal use (you dont have to replace them as often as people claim), but they do go bad quickly on imported engines/clips. You never know their fully history or how long they sat in warehouse somewhere with all kinds of corrosion going on. You pretty much have to replace to plugs, wires, cap and rotor when doing a swap.

My car used to buck a surge like crazy under boost, because my timing belt wasn't exactly perfect. It caused all kinds of uneven idle issues too. So the checklist comes from issues I've had to troubleshoot with my own car over the years.

This post has been edited by lagos: Apr 6, 2013 - 12:33 AM