1998 Pontiac Firebird low idle wear noise

I thought that what was wrong, so I bought a new one. About a month or two ago. I also thought it was the throttle positiion sensor, so I also bought a new one. No dice.

Yes.

Is this a good pic I coud remove the air intake, so you could see the whole throttle?

I know what screw that is, how much should I turn it, or how high?

I did the throttle stop adjustment. At first I did it too much and the RPM were going up and down erratically at a stop(it would be idling correctly then the rpm would go down slowly, then they would jump into 900, repeatedly. So I lowered it a little and it stopped idling erratically, but the RPM still would drop(500rpm, then it start shaking a lot). What I am thinking it is that vacuum line that I found not connected to any thing, probably the end I can't find is causing my car to do it. I just need to get a diagram of the vacuum line. Where to look for one? Is there anything else that may cause this?

No there isnt one, I also checked in my repair manuel and there was not one on there only the electrical(which does me no good.)

I bought a manuel online and it had the diagram. I just hope this is the problem. But by the look of it I think it is. Thanks so far for everything I will get back to you with results. Laters

Well it running better but it the idle just drops. Sometimes when I start the car it starts really weak, like it want to turn off but stays on. I usally just turn it off and start it again and it goes away. Maybe it is my fuel pump or something. Any ideas?

I havent checked but will go to autozone today to find out.

I went to Autozone again to do a check for error codes. I found out that I had two new codes. They were p0412 and po418. The po412 was giving ma AIR bypass solenoid malfunction. I think this do to the fact I removed my egr valve. So What I am going to do is reconnect my EGR valve again and see if the codes come out again. It gave me other codes too, but they were the egr valve code and the o2 sensor after the cats (long tube header installed). I will get back to you with result and is there anything else I should do.
These are the codes:
16796 - P0412 Sec. Air Inj. Sys. Switching Valve A Circ Malfunction - AIR bypass solenoid malfunction.
16802 - P0418 Sec. Air Inj. Sys. Relay (A) Contr. Circ Malfunction

I finally had time to put EGR back on. One I put EGr back Codes went away and only thing showing is O2 sensor 3 and 4. But I idle problem still remains. I just dont know what to do?