OK my 02 Monte SS has been running ok from cold starts but after it gets warm starts to sputter an acts like it don't wanna go n die out I have changed the cps but I also know I don't have a factory exhaust it looks like someone welded random pipes together but idk how to correct the problem but I don't have a cat converter on my car so idk what to do

 

I would check the fuel pressure regulator. If it's bad, it will dump fuel into the engine. With the car running, remove the vacuum line, and if you see gas coming out, it needs to be replaced pronto.


Also, do have the check engine light on?