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Originally Posted by lorainfurniture
Take your car for a drive tonight, then pull in to your driveway and look. Make sure it's as dark as it can be. I chased a problem like this for a long time before I noticed arcing between the wires and the cylinder head. Ironically, I. Was dumping washer fluid in when I saw the spark.
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Thanks. Yes, I actually did this. Drove into my garage, closed the door behind me and turned off all lights .. it was pitch black and I didn't see anything. In the two years I've owned it I've only driven 16k miles and I must have changed the plugs, wires, distributor and rotor about 10 to 12k miles ago, if not less. I had the plugs out about six weeks ago when I did the compression test and they were a light tan. My duty cycle is 50%.
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Generally speaking, when it is a consistent stumble, it is fuel related. When the miss is completely random, it is usually spark related.
Keep in mind that 80's vintage cars need new spark plugs regularly.
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That is useful information. What are the characteristics of a vacuum leak?
Also, is there any significance to the "rough in gear, smoother in park/neutral" observation?