my new HD died while on cruise control at 70MPH. Dealer says theres another one in the shop that did the same. They don't know what it is but obviously suspect sensor or computer. All they know so far is plugs are fouled.

Has anybody our there heard of similar problems?

What a drag...

 

Your explaination is a little vague. Did the dealer explain the problem, ie, any codes from the ECU? The HD, Lightning, F150, etc. all use the ECC-V computer which, overall, is extremely reliable.