I played with the cruise control a bit over the last week. My wife drives the car regularly and wants the cruise control fixed.

So I took the car for a few spins and here's what I was able to see:

1) Cruise Contol works below about 40mph just fine
2) While pushing the cruise control lever to accelerate, it will accelerate all the way to around 55-60mph then quit accerating and not hold speed.
3) Pushing the lever back to accelerate after this will get a very brief acceleration (maybe 0.25-0.5s worth) but then it will not hold speed or accelerate again.

So are these all symptoms of the Cruise Control Amplifier going bad?

If it is, where is it located at and is it an easy thing to replace? Anybody by chance have a part # for it for a 93 500SEL?

Thanks again.