[gacook]

I know this is a Porsche forum...but I respect the overall mechanical intellect of many of you here. With that said...

2003 Nissan 350Z. For the past several months, I've had an issue with it occasionally "stuttering" for lack of a better term. Slightly rough idle at the low range. And this is totally random. Sometimes happens at start up and goes away after a couple minutes; occasionally happens 2-3 hours into a long trip and lasts 10-20 minutes. Sometimes throws the CEL; sometimes doesn't. If it DOES throw the CEL, it always clears itself after it starts running "right" again. OBD reader says "random misfire"--no schit. So, here's what I've done to resolve the problem to date:

New plugs (old ones didn't look half bad)--no change.
New coil packs--no change
Ran seafoam through the system. Worked good for a week; then started the occasional sputtering again.
Cleaned the MAFS a couple days ago. Ran PERFECT for 2 days. I mean, it felt like a completely different car; brand new. Last night, it "hiccupped" for maybe 10 seconds, but that was the extent of it. Unfortunately, I still think the problem is there because I seem to be getting some slight power loss ever since the "hiccup." Very slight, still better than what had been happening, but I notice it.

I'm leaning toward thinking I need to replace the O2 sensors next (it IS a 125K mile car...). What do you guys think?