When the car is cold it runs rough and stalls. Once warmed up, after 5 min or so it runs great. Have replaced MAS and IAC as it was stalling every time I accelerated. Now it's fine when warm but still stalls and chugs when cold.
Is the check engine light on ?
It sounds like the engine temp sensor is not right, but if that were true you should have a check engine light and a code for the sensor.
Have you checked fuel pressure ?
SOURCE: Car starts then stalls once the engine warms up.
You need new timing belt and gears. Buicks gears are made of plastic, and become a big glob. Nothing for the timing belt to grab onto.
SOURCE: 1990 Buick Century 3.3L Check Engine Light comes on, stalls.
Need to check for fault codes. Possibly a faulty sensor causing the fuel system to run rich or lean.
SOURCE: my 1993 buick century will start and run great for
sounds like the crank angle sensor. my 1993 buick was doing the same thing. hope this helps.
SOURCE: I have a 1991 buick regal stalls and shut off after warming up
egr valve is not opening up when the engine reaches it normal operating temperture
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