Dolzell

Sorry for the late response. I had a bjj tournament this weekend and during the traveling to and from the last couple of days I haven't really noticed an issue. I wanted to be sure before I posted and sure enough today its back. It doesn't have a MAF sensor to answer your question. And thanks everyone for the help so far.

Ok here's what I have (averages) Idle: st; 0 to 10% lt; -15 to -20% Load(4th gear, 20mph, 1.5rpm, full throttle): st; 0 to 10% (sometimes negative) lt; -8 to -22% Wide open (2nd gear, 4krpm): St; 0 to 8% Lt; 0 to -17% These are from quick glances because I had to do this alone as I'm on vacation and everyone is at work and that's the last place I want to be haha. Edit: I stopped at a park to post this and when I restarted the car it was idling moderately rough so I looked and they were St 20 Lt -26 Like I said I'm not familiar with fuel trims and such and I didn't know if this would help. I just hadn't seen them that high

Rooster2, I was thinking along those lines as well. Fairtax, I'm not proficient when it comes to fuel trims and of course when I hook up my scanner and start the car it doesn't do it (even though I just shut it off 5 minutes ago after driving two towns over and it was doing it). It was running a little rough and my short term fuel trim was 13% Long term fuel trim was -22% However after I've sat and watched it the last ten minutes the car has smoothed out more and now they're Short term .8% Long term 0 to 1.5% I think you may be onto something, sir.

I really don't like asking the Internet for automotive advice because it's like being asked over the phone or when you're nowhere near the persons car and I know all too well how that is. However, I haven't been successful in tracking down this issue so here I am. I have a 2002 Subaru Legacy GT (non-limited) and it's developed this annoying little idle surge. Most of the time it's just annoying but there are times it feels like it will stall but that is not that frequent. Driving along seems fine with the exception under heavy load (i.e. In 5th gear at 2k or less rpm and give it moderate gas) you can feel a "hiccup." Some details: Plugs and wires are all new. 3 step fuel/injection service has been done. No pending, history, or current codes. The iac, tps, map, and other sensors seem to be functioning when monitored in the live data stream. I can't help but think it's a fuel issue. I've filled up 3 times since it started but it still persists. I've only seen a clogged fuel filter give issues in hight rpm which is not the case. I'm stumped. To be clear the the surge is a drop to about 500 then bounces to 700 or so rpm and back. Sometimes it will level out. Nothing drastic but enough to feel annoying