runs rough on 1991 Saab 900

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
when i start the car it acts cold,if i reset the check engine light it runs worse i have changed the fuel filter,o2 sensor and cleaned the map sensor the plugs are good,not sure i think its vacuum or sensor problem,it seems to want to die after you put in gear and has no power could it be the catalytic converter?thanks
(1) Answer
I'd say, look for an intake air leak.
I suppose it could be the catalytic converter, it could be getting plugged up. If so, you could possibly be able to tell by putting your hand up to the exhaust outlet pipe and feel a steady flow instead of pulsing exhaust gasses.