I have a 93 f-150 auto with 136,000 miles, it has always run good til about 2 weeks ago, it started idleing a little rough. Then about the last three days it is really bad. sometimes when i start it up in the morning it will rev up to about 2000 rpms then stall, it will do this like 3 times then it will stay running but still idles rough. It also like boggs down or stutters when i take off but once i get going it runs fine. Any help is appreciated thanks.