Weird idle and low RPM acceleration problems, I owned myself. Options

[GriffGirl]

Two days ago when I left work for the day my car ran like complete crap. It ran fine that morning, but going home it was rough and crappy, and has been since.

The car starts just fine, but at idle, it idles low and very rough. When driving, it accelerates very poorly, and the acceleration is rough. I can floor it in 2nd gear on a steep hill, and not be able to get above about 23 mph. Acceleration smooths out at around 40mph, or above at least 2600 RPMs. Cruising speeds (45-70 depending on the road of course) feel mostly normal, unless I try to accelerate to pass or something. Accelerating from cruising speed feels smooth, but is very slow going. Oh- and if I drive below 40 with the a/c on, it just sucks what little power is left out of it and the car just barely wants to go. A/C on at idle, and it almost stalls out.

This hasn't been a progressive thing at all, it literally feels like it just started out of nowhere. I've checked my vacuum lines, nothing came disconnected. I cleaned out the throttle body but that didn't matter. I *attempted* to use seafoam through the brake booster line, but there's no suction. Idle increases to 2000 RPMs when brake booster is disconnected, but I thought maybe I should rev the engine with the line in the seafoam - I couldn't remember. So I haven't gone back to do that yet. (will it make a difference?)

Any ideas that specifically jump out at you guys? This weekend I will check the IAC. Next weekend I'm doing an oil change, so I will also do a tune up and replace plugs, wires, cap & rotor. Air filter is Injen and was cleaned about 5000 miles ago, but I'll probably clean it again just for good measure. (it didn't look too bad when I removed the intake to clean the TB yesterday)

HELP!

oh yeah - and if someone wouldn't mind telling me exactly WHERE the IAC is on my car (7AFE) that would be faboo. I know it's somewhere @ the bottom of the TB...?

This post has been edited by GriffGirl: Jul 21, 2009 - 10:35 AM

[GriffGirl]

I seafoamed just now; had the wrong end of the brake booster hose disconnected. DUH. No wonder there was no suction! LOL

Other than a CRAP LOAD of smoke, it doesn't seem that the seafoam helped. I did however notice that an alarming amount of smoke was actually coming out from my exhaust manifold. Not nearly as much as my tail pipe, but more than I'd image should come out, and definitely more than the last time I seafoamed, about a year or so ago.

Tried to reset the ECU. Is the ECU the fuse that's labeled "MAIN 60A"? Even looking at the relay components diagram from the BGB, nothing actually says "ECU". And I can't seem to remove the EFI Main Relay. I'm afraid I'll break it. What is the correct way to remove it? Lastly is the HTR fuse, that's a small one and is easy to remove. Anyway I wound up just pulling the one that says "MAIN", thinking it's probably the ECU. We'll see how it goes when I drive home in a little bit.

Note: Coomer's write up says to remove the Hazard, EFI and ECU from the relay box under the hood. That's not where my Hazard fuse is located, I wonder if his write up was based off of his silvertop? The hazard (at least on a 7A) is located under the kick panel, behind the fuse box, up under the dash. I'm not messing with it.

I have a spare TB @ home, IIRC it has the IAC on it... maybe I'll take that one apart so I know what I'm doing before I go screwing anything (else?) up.