Detail: 99 grand prix se noise that stops after the car warms up
Solution: You might try checking the oil level, this might help if it sounds like a ticking noise in the engine compartment , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck!