Someone please help me !

[1.8laser90]

ok guys needs some help,
i started the car up the other day and let it sit for about a minute, pulled it out and let it idle for abit and when i look down at my gauges my check engine light was on, so i was like sweet maybe it will give some codes to help solve my idle prolblems cause right then it was idleing crapy and didn't seem to rev freely. so i shut it off and tried getting codes. i got code 11 which is o2 sensor, which this is the 2nd time it gave the o2 sensor so i can replace that no prolblem. then i got another code 13 which is intake air tempature sensor, what the heck this is the second air flow sensor that has gone bad. and then i got code 23 which is camshaft position sensor. where is this located and why i am getting all these codes at the same time? its done this before and thats when i replaced air flow sensor and reset the ecu which was a month or 2 ago. another prolblem my car has is when its just cruising not giveing it gas but not letting off its gets very jerky and like stumbles, i have bin told that it was the tps sensor but shouldn't it give me a code for that if its bad? or does it just need ajusted? if so how do i ajust it? my car seems to have alot of electrical problems and everything i do doesn't fix it. please help me get this car running good Again it hasn't idled normally for about a year and its had electrical prolblems as long as i can remember.
the ecu is rebiult about 3 years old and i have checked the caps they look very good.
it has new plugs and wires. 8mm taylor wires and platnium 2 plugs.
used air flow sensor, it used to stall before i replaced it but doesn't anymore but it still idles bad. i have taken the throttle body off and cleaned it all up and and checked the isc motor and it works good. so any help would be greatly appreciated.
thanks alot Cory

 

[AwdMikey]

The camshaft position sensor is the circular unit bolted to the side of your engine on the passenger side. It determines when to fire the injectors. The stumbling you talk about is likely because of this sensor. When it goes bad, it can cause half, or all of your spark plugs not to fire. This would cause the jerking / stumbling you are talking about. You can test the CAS by unbolting it from your engine, turning the key to the on position, but not cranking it. Turn the arm on the CAS and listen for the spark plugs / injectors to fire. If they do not, you know it is bad.

 

[1.8laser90]

is that on the 1.8l engine, cause i have heard about that but thought it was just on the 2.0, i have a 1.8l.