I have a 1996 Ford Windstar, 3.8 L, with 200,000 mostly highway miles that has had regular maintenance. Recent repairs include new plugs, fuel filter, and air induction flush.
The van has a sporadic miss with the check engine light flashing at times, both at town and highway speeds. Other times, the engine light is on steadily. There is a noticeable reduction in the miss after adding a gas cleaning additive.
If you have any ideas what might be the cause, I would appreciate your suggestions.
Thanks for your help.