Problem with My 2004 Chevy Malibu classic 2.2L. My girlfriends car just started acting funny last week. It died on her a couple times, then would take several tries to get it start up. Eventually we couldn't get it to start at all.I checked all the fuses etc. So I decided to replace the pump and filter. After that it started up and ran. When she got home it wouldn't restart again! I also should add that the theft light is blinking, and the door locks occasionally lock and unlock by them selves.
Answer: This also applies to 1999, 2000, 2001, 2002, 2003 years. A common problem is the ignition cylinder and/or the ignition switch. With the buzzing of the relay, i would say all this may be related to the ignition switch. A low voltage supply to any of the circuits that the switch feeds will give strange electrical conditions. If going to replace the ignition switch, then also do the cylinder at the same time. With all things described, sure sounds like the ignition switch. P.S. The locks may be related to the ignition switch problem or not at all.