Stupid Cavalier

I have a 1996 Cavalier Z-24 and Friday night my cat and restinator was glowing red so I took it the cat went bad. Ok so I had the cat changed and now the car lopes real mad and sounds like a pissed off go kart. I checked the ICM and the ignition along with the egr value changed the O2 sensor and I let it run even though it was still running rough and the new cat got red again so I said maybe the resinator is stopped up but no the damn thing is still running bad any suggestions would be appericated.:banghead: :banghead: :banghead: :banghead:

what motor is in the z-24....is late and i can;t remember to save my life. leaky injector/no spark to one or more cylinders. sounds as if alot of fuel is getting into cat and burning, hence the glowing red. is CEL on/flashing as all?

what motor is in the z-24....is late and i can;t remember to save my life. leaky injector/no spark to one or more cylinders. sounds as if alot of fuel is getting into cat and burning, hence the glowing red. is CEL on/flashing as all?


The motor is a 2.4L Quad 4. I checked the no. 1&2 spark plugs and the spark wasn't as strong as the no. 3&4 spark. Do you think that is the problem maybe not the spark plugs but a coil pack or something.

pull the wires off 1&2 and look at the terminals on the coil pack, if corroded, then replace as that will inhibit spark. plugs been changed recently, and wires?

pull the wires off 1&2 and look at the terminals on the coil pack, if corroded, then replace as that will inhibit spark. plugs been changed recently, and wires?

Yeah all the ingition has been replaced now and still doing the same thing. Thinking it my be the EGR value I dont know it's getting old fast.