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I've had my '84 LX convertible since it was almost new. It only gets driven about 3-4 thousand miles each year, and seldom on long trips, so the cruise control doesn't get much use. The last time I tried to use it, which was the first time in about a year, it wouldn't hold a constant speed. When set on 70 mph it would hold for a while, then slow to about 55, then speed up to as much as 85 before slowing again. Does anyone know what might cause this?
It's a carburated 5.0 5spd. I put a GT40P engine in it last year, with cam, headers and off road exhaust, and pulled all emission controls off. I wouldn't think any of that would effect the cruise control, but ???
 

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Check the vacuum line. It's possible that the CC servo is on its way out, too.
 

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Check that the vacuum ball for the cruise holds. The servo can be tested also using a vacuum pump. You can also test the lines with the vacuum pump also. I guess you need a vacuum hand pump. lol
 
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