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 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): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
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    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 Enthusiast
    Automobile(s): 1980 FBC
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    Re: 78 DeVille has a rough idle

    Did you ever get this working better?

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