Most likely a vacuum leak , here are another few things to check... distributer cap and rotor ( all in one pk specific to your car ) should be changed once a year , spark plug wires ( the wires coming from your distributor to your spark plug). Should be changed once every 6 months . Your spark plug ( a decent brand ) also should be changed once every 6 months . Fuel filter once every year .. And air breather checked and or changed once per year... anyone of these things if ignored will cause problems with stalling when coming to an idle.. Also I find a lot of people have partially failed thermostat which is partly open , sticking or failed closed have major stalling problems.. Good news is non of that stuff is terribly expensive and if your half way handy then YouTube it and do it yourself. Ps. Always buy fail open thermostat. I believe the brand is called failsafe. More cars hit the wreckers because of fail closed then you can shake a stick at.
Check the vacuum pipes on the intake might have a leak
Also check the booster pipe
90% of the time you will a perished pipe causing the problem.
If it's a automatic it could have a developing trans problem which the clutches getting sticky, or a sensor feeding the wrong info. On the engine there is a idle control system that may be sticky or gummed up with carbon. Could be a bad vacuum break booster that let's in air while braking, leaning out the fuel air raito beyond the computers ability to adjust for. Minding safety, try going into n before you stop and see if the stalls get better, also idle in the yard with it in drive, with and without the brake pedal applied.
Any codes? Sounds like maf sensor or tps.
SOURCE: Choke Light rough idle
adjust your carb, the 2 screws on each side of the carb adjust so you can get the car to idle correctly, also check your distributor
SOURCE: 1999 Grand Am 3.4litre idle problems. Starts rough
it sounds like you have a injector leaking down into one of your cylinders so it is flooding out a cylinder thus runs rough and long cranks.
SOURCE: My 99 Malibu starts idling rough and dies at
ok does it shake badly, the engine that is? you may have alot going on. is the check engine light on steady or flashing? and 4 cylinder or 6 please
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SOURCE: rough idle then stalls
Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.
Testimonial: "Found the problem vacume leak like you said."
SOURCE: When i'm stopped at a light or sign my cars rpm's
When i'm stopped at a light or sign my cars rpm's go down and my car shakes and sometimes either acts like it wants to die or just dies
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