My cruise control started doing some goofy stuff tonight on the interstate. To make a long story short... It WILL engage but doesn't hold the selected speed. Last week it started "spiking" about 8mph beyond the selected speed. Tonight it will just slow down until it disengages. It is definitely engaging but not "pulling it's wieght". It will not accel with the stalk nor will it resume with the stalk. All it will do is engage and then slow down then disengage.
Can you help me find the problem? BTW, 1985 300SD
Kevin