78 DeVille has a rough idle - Page 2
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500, 472, 425, 368 Discussion, 78 DeVille has a rough idle in Cadillac Engine Technical Discussion; Originally Posted by cadillac_al I have seen some very worn throttle shafts and the vehicle still ran perfectly fine. I ...
  1. #16
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
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    67
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    Thread Starter

    Re: 78 DeVille has a rough idle

    Quote Originally Posted by cadillac_al View Post
    I have seen some very worn throttle shafts and the vehicle still ran perfectly fine. I don't think that will be the cause of the stalling and rough idling.
    I agree. We are removing the intake again because everything points to an improper install or a cracked and/or warped manifold. It just seems odd that on a Wednesday, it ran great then on Thursday it stalled at a stop sign and now wont idle below 1000 RPM and is very rough.

  2. #17
    the APEMAN is offline Cadillac Owners Fanatic
    Automobile(s): 1980 FBC
    Join Date
    Mar 2010
    Age
    52
    Posts
    219

    Re: 78 DeVille has a rough idle

    Did you ever get this working better?

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