I have a 1989 Buick Park Avanue 3.8L engine. I am having trouble with the cruse control. It inguages ok and works fine for a while then speed begins to drift down. The cruse indicator light is still illuminated and if I push on the accelerator and bring it back up to cruse speed it will enguage once again. This process will then repeate itself again. I suspect it is a vacume leak but as yet have not found an obovous leak! Could the acuator be leaking down slowly?
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