I have a 2000 5.4L expedition that is having an electrical problem I think. Started with a bad alternator, that was replaced, then after experiencing the dash lights flickering and hesitation when you get on it a little, we found the alternator had a bad diode, so replaced it again. Now, we are experiencing the hesitation and occasional flicker, but the alternator tests good, battery new, and no codes. Check it with code reader at Autozone. They suggested taking to dealer, but don't trust the local dealer. Could it be a computer of sorts that might have gotten fried from the bad alternator putting out AC? why don't I get some codes? almost runs like its not getting air or fuel when it starts acting up. Any help would be greatly appreciated!!!