I have have a 1994 E350 with an intermitten miss from Idle to mid throttle. I HAVE DONE ALL OF THE TUNE UP PARTS, FUEL FILTER. TOOK IT TOO THE DEALER I WAS TOLD IT WAS A BAD HEAD. I DONT THINK THIS IS THE ISSUE THERE IS ONLY 46000 MILE ON IT AND THE PLUGS ALL LOOKED GOOD WHEN REMOVED.