CMF Veteran Member
Join Date: Feb 2010
Location: Northwest Louisiana
Re: 2000 Chevy Malibu 3.1 Stalling/Starting Issue
I had similar once. My fuel pump (THAT one!) was failing, and it could not pump enough fuel, even though on key on engine off it had plenty of pressure (as soon as the motor started running, it'd drop to about 21 to 23 ... and if you popped the throttle body, it'd drop right down to 5 about when the car stalled.)
I'd do a pressure check while the car is running.
To do this, take a long hose on the pressure gauge and tape it to the windshield, making sure the hose isn't crimped too tight when you shut the hood on it, and drive around the neighborhood.
Use only a high quality hose on this - a cheap one may break, and spew gas all over the place! NOT a nice thing to do on warm exhaust manifolds!
At the current mileage, I'd be swapping spark plugs ANYWAY as PM. 70K to 80K is where some platinums are starting to be worn out due to the gap eroding. My Cougar, for instance, gets about 40Kmiles on a set of Bosch Platinum Plus plugs. (They're 70 cents each on sale when I buy them, so that's not a big deal to me. Even if it means I change plugs annually ... )
335K miles on original motor and tranny (only motor work 2 x LIM replacement), Monroe SensaTrac struts front and back (new at approx. 300K miles), and Alero discs in back. LS fogs added with custom wiring. HID high beams, HIR low and halogen fogs. Raybestos Pro Grade front rotors and Bendix D747 ceramic pads on front.
Addendum: Rest in peace. Surge tank blew, motor overheated, I think she's lived a long and useful life.