Ruff Idle 92 Grand am

I have a 1992 grand am 3.3 when it is cold it runs good when it is warm and you re start it it runs like crap with the SES light on and may even stall
start it up and shut it off then start it again and it may run good with no SES light
I replaced the crank shaft sensor no difference
I am getting a code 42
Any ideas or help please
Thank you

Just checked our list and 42 brings up...........

Bypass or Electronic Spark Timing (EST) circuit

Got me on that one :dunno: Google it up...

Also someone else will reply with hopefully more knowledge that I have lol