parts i know are good:  new air intake tempature sensor, new map sensor, new idle air control, new throttle position sensor, new egr valve, new egr valve sensor, new coolant tempature sensor, new o2 sensor, new vaccuum lines.  car has hesitent starts, will start and immediatley stall,then will start idle up then down close to a stall then back up and so on, while this is going on and i give gas there is a severe lack of power almost to chocking.., but about every two times of doing this it will run like it somewhat ok and has no lack of power when excellerator is depressed, but at idle you can slightly feel the up and down of the engine idle but not so drastic.  the engine codes are 23 33 44. PLEASE HELP!!  

lets start here....

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280047724

i would also think that you need to check for exhaust leaks... and diverter valve up stream air leaks... the diverter valve on the smog pump system should only have air injection to the manifolds for the first few seconds of the engine running...  when these valves and check (gulp valves)  go bad they dilute the burned air as it goes across the oxygen sensor..(excess oxygen in the exhaust stream)   . this throws off the fuel mixture calculations...  sets a code 44...  makes everything else screwy...  hard to find...    unless you know exactally where to look...   pull the hose off both air injection manifolds...  plug them off temporarly.. so no air leaks into them...

see if when you run the motor the air is pumped out the hose to the upstream/manifolds...

the downstream air into the cats does not affect the mixture...  

the 22 is a  low voltage seen at the throttle position sensor...

i take it that you have a digital volt meter..    test the black wire to the dark blue wire... ... you should have a variable voltage there... but never less than 0.5 volts..  and almost to 5.0 volts as you open the throttle...

the coolant temp sensor and the throttle position sensor share  the same ground back to the computer

the map sensor and the throttle positon sensor share the same 5 volt output from the ecm....


check the air injection leak into the upstream air first... the check valves rust out.. the divirter valves go bad and leak... many times they are burned out...

this is the most likely problem,....

do you have access to a scan tool...

a worn throttle shaft bore will also set this code 22 as the throttle shaft can move around and stop at a differnt angle every time...  

with the engine off... open the throttle a bit with your hand..  see how much play is in the shaft to bore ... you can tell... it may wiggle a bunch...

these can be bushed by good carb rebuilding shops...  the screws are tiny metric... and hard to find... just incase anybody decides to take it apart to inspect. them...   the tips of the screws have to be ground off as they are flattened... and will stick and break off in the shaft removing any possibibality of getting that one fixed...