A small problem causing big headaches!

for the car info
1996 Dodge Stratus
2.0 single cam
manual trans

Stuff i replaced
coil pack plugs wires fuel filter

Problem
Ok while driving around with the ac on if i come to a red light the car will stall out. The rpms will drop and not catch back up. If i drive around with the ac off it will not even stall out! What weird is the car will not idle up when the ac is on. it idles at 700, i even tried to turn the idle screw up and it still idles at 700. It also uses a lil oil. But it doesnt blow any smoke of any kind and its not in the anti freeze. So any clues poping out at ya that might be a fix to this? Thank you for reading and for the advice you give.:grinno: i have done some research and im just looking for a lil more pin point before i go changing egr valve cat or crank or cam sensors. Thanks.

Look for a leak in a vacuum hose. If you can, connect a vacuum gauge to the intake manifold and look for about 17" of vacuum and stedy. If not look for a vacuum leak.

ok thanks for info ill go do that

the check engine light is coming on my 2004 dodge..it came on while driving on the highway..it had flashed previously but now is on solid what could cause it?