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You have a vacuum leak somewhere. The doors are vacuum operated and the vacuum is supplied by the engine. When the engine is running there is enough vacuum to close the doors, but when the engine is off there isn't.
Hi there: There are many different possibilities depending on calibration codes.. You have a PDF FIle with this details, including all the
possibilities for the vacuum diagrams for the 1979 model 400 Ford
engine: HERE.
Have you tried your local Salvage Yard, you will need Year and engine size, and most often if they don't have "Harmonic Balancer Pully", they can find one useing either Hollander or CarParts.com that Salvage yards use to talk and exchange parts with echother....
I remember my dads 77 T-Bird
He used to run the A/C in standing traffic and boy would she get hot.
Then the car would be tough to start and would stall at the light, pretty much any time the car went to idle.
****Check you vacume lines****
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