One problem related to check engine light on has been reported for the 1998 Lincoln Navigator. The most recently reported issues are listed below.
1) driving up mountain pass, 65 mph with children in car, truck started aggressively shaking, check engine light blinking ,had to pull off to far right lane with diesel truck on my rear end. Smell of gas in cab, had to get children out of car, had to stand by busy highway in the dark for help. 2) blown spark plug - stripped the spark plug hole, burned coil 3) car in repair shop for 2 weeks, replaced cylinder head, coil, spark plug. Car still "bucks", taking back to shop as I do not trust car. I see many, many posts on internet with same problem. Please help as my children were put at risk due to fords chronic "spark plug blow-out.