Any ideas why my 98 Legacy L with EJ22 has developed an intermittent stumble at highway speed? It happens when engine is warm and maintaining a steady speed. A single, instantaneous stumble might occur twice during a two hour road trip, but I know it's not going to heal itself. Feels like more than a single cylinder misfiring once. Could it be electrical even though there is no CEL? Past experience with clogged fuel filter on other cars has been loss of acceleration. This thing still accelerates as well as ever.
We're having a heat wave - might get to 40* - so I'm going to go for a drive and see if I can make it happen.
My wife prefers this car over our near new Accord, but I don't want to turn her loose with this issue.
Thanks for your advice.