i have a 96 f250 7.3 when i start the truck it has a bad idle surge about 500rpm but you throttle it up for about 10 second and then it idles fine i did have a bd chip and the truck got to acting funny so i took it out then a few days later it started acting this way so i put the chip back in a now it revs up when you first start it but it still act funny with the chip in any help thanks greg