89 300 TE cruise control will not hold steady speed, very slight variation 2 to 4 mph, enough to make the ride uncomfortable, would this be a vacuum leak??
Where do I start?

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'05 Ford Escape 100,000 miles
'87 560SL 92000 miles
'89 300TE 199,000 miles
'02 Audi TT 100,000 miles
'00 Ford Excursion V-10 121000 miles
'92 Mercury Capri 100000 miles
'02 BMW 325XI 60000 miles
'92 230CE 160000
'87 BMW 535SI 160,000 miles
'93 Rinker Captiva 209
5 Kids
2 Dogs
1 Wife

Could be the electronic control module. On 123s, 126s, and 107s it is often necessary to open it up and resoldier points on the circuit board. I'm not sure how it is configured on a 124. Nevertheless, you should read through this thread and the ones linked within it.

Cruise control

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Peach Parts W124.128 User Group.

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