1979 Lincoln Town Car Continetal Idling rough? *REPOST*?

Question:
I just bought the correct battery, correct plugs and wires oddly enough to help my town car run smoother but in fact it runs rougher especialy when I push the brakes in and I am waiting at a stop light. What should I do and what is causing this madness? No loose motor mounts and the timing is fine. Could it be the NEW carberator or is something grounding it out? Any info is appreciated, Thanks

Answers:

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A rough idle can be caused by a split or broken vacuum hose...look all around the engine compartment for small rubber hoses, there'll be a lot...be thorough, and check every connection you can find.

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Also, a worn set of plug wires will give you that rough idle feeling, since they arc through the insulating rubber...

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Not to step on toes here, but a bad vacuum booster for the brakes will normally give you a hard pedal, AND if really split will cause the engine to die rather than idle rough.

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Last, but not least, do a compression test on all cylinders...none should be more than 10 psi different than the others and/or 10 psi lower than rated compression...

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Hope that helps some...

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It's probably the carb. I would hold it to the floor for probably like 10 minutes.

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Performance problems that show when you have your foot on the brake usually indicate a bad vacuum brake booster.

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I suggest hooking up a old fashion vacuum gauge and see what the readings are, you need 16" or higher at idle and it should NOT drop when step on the brake.

Oil on my engine?

You should make sure the plug wires are connected to the right cylinders and the correct places on the distributor also. If incorrect it can cause the car to backfire and shake like a tank.
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