Anyone one else had this happen? My idle jumps from 600 to 900, the engine will have a miss a times while idling, and my engine craps out at around 1500 rpm untill about 2000 rpm then runs fine. I have a 01 5.4 I was in arizona and it was hot, about 120. Any help would be appreciated, I am used to the dealer blaming on the exhaust in the past. My last truck did the same thing and it was a bad coil pack, a 98 4.6.
Thanks, Terry