So, I haven't messed with any of the emissions other then removing the air pump. Sleeves in the aux ports have been removed.

So, my car used to idle fine, but slowly it has started to die when dropping to idle.

If i get it to not die, it will idle at 750 just fine, but if I rev up and then let go, it drops down, and drops into the 300-400 RPM range (according to SAFC-II) and sometimes dies.

I have also noticed that when I go to shift, and I let go of the accelerator, and then shift, and then begin to push the accelerator back in, there is a slight delay between pushing and it going. Even with the clutch in, without letting it out, just pushing on the gas, it seems to be bogging or lagging before the engine picks up in RPM.

I have replaced spark plugs, wires, adjusted TPS to .95K Ohms when the car is at operating temp. Haven't found any dead spots in the TPS, used analog multimeter to test for dead spots, and a digital multimeter to set TPS.

Have a new air filter in the car.

My only thoughts could be a failing BAC? Maybe sticking a little? That is the only thing I can think of. Any ideas? Thanks guys!

 

So, there was a vacuum tube that had broken. it was a hard line type plastic with soft ends. It connected from the back of the intake, to a metal pipe near the transmission.

 

Hmm, so, it idles fine when it is cold, but as soon as it reaches operating temp, the idle drops when I let go of the gas, and goes really really low. Eventually, if it doesn't die, it brings itself back up to normal idle. All I can think is it has something to do with the BAC. FSM says the BAC is supposed to help stabilize the idle. It is weird that it only does it when it is warm though. But maybe because when it is cold it is idling up at 1.5k RPM.


Well, any ideas? Am I right about the BAC? Thanks!

 

So, checked BAC, it is fine. Checked all vacuum connections. They are fine.

Still when it is warm I am getting surging idle. I noticed that when my car drops in idle, it shoots up again, then drops, then shoots up. When it does this, I hear a weird BOV type sound from the MAF. Might just be the air being sucked in from idle up.

Well, please help. All I can think is an intake gasket or something. Because, when I press the gas at any RPM there is a hesitation between press and go. Only a second or so.

Only other thing I can think of is failing injectors.