[exgmguy]

I had to give my car a vacuum leak to keep it surging at idle. I also have that *******' E-303. I just took off the smallest vacuum cap from the tree.

You can also try resetting your computer. Disconnect battery for 20 minutes.
Reconnect battery, unplug IAC motor, start car.
Adjust idle to about 700 rpm on a good tach. (The factory one is off.)
Adjust TPS voltage to .95v-.98v.
Shut car off.
Plug IAC motor back in and start the car.
Let it idle for 2 minutes with all electrical accessories running.
Shut engine off for 2 minutes.
Let it idle again for 2 minutes with no accessories running.