Stalling When Warm

I have a '99 Alero that starts fine when the car is cold, but when I try to restart when it is warmed up it stalls unless I give it gas. I did a complete tune up, cleaned the IAT, cleaned the fuel system, new fuel filter and still have the same problem. I am getting a 442 code once in a while.

Any help would be appreciated

sounds like a coil getting hot...or a vaccum leak take a can of carb cleaner and spray on vaccum hoses when it's idle if it idles up that means leak
have you changed o/2 sensor yet?

Welcome to AF.

It would be helpful to post your engine size and mileage.

Thank you for the welcome.

I have a 3.4l V6 with 100000 miles.

I havent change the o2 because it never theu a code and how do I check the coil?