I have a new vibration in my 2003 Excursion, occurs during the last shift around 45 mph. The engine is also running very rough and the engine light is now on. Not sure if the 2 issues are related, but they both started about the same week.
A buddy of mine said he had a similar experience w/ his 99 Expedition and it was the fuel injectors. I'd rather it be the injector than a transmission issue. Thanks.