gas fliter and a air fliter would help.
have you tuned it up? plugs, wires, cap + rotor
plugged catalytic converter
Yes, have the code read to find the problem. There are a number of sensors that will cause this.
Mine did that and it was the rear oxygen sensor.
Have you connected a code scanner? What is it saying is the problem?
If you have not already replaced your spark plugs then do so, you might also want to check the coils while your replacing plugs if it still runs rough with loss of power try sea foam to clean your crank shaft and your injectors and all the fueling system.
you need to make sure your plugs and wires are ok, if it is still rough 9 out of 10 chances it is your intake manifold gasket.
check your mass air flow sensor. Im having the same problem right now with my 1991 Pontiac Grand Prix & i had a mechanic tell me it was my mass air flow sensor.
idle air controll,leaking fuel injector,egr stuck
Go ahead and replace the pcv
You should check to make sure that the electric fan is working.
Possible valve cover gaskets are leaking oil onto the plugs and the oil is getting into the cylinder. The oil can also short the plug wire and damage the plug wire causing the check engine light to light.