when starting cold get a starter bump or pre ign bump after 1 sec then fires right up. I replaced the starter, battery and cleaned
up grounds, tried a factory tune, no help. It's like only when cold and cold out the start up fuel get's lean for a sec or the timing
is too advanced for only a split sec.

The truck starts to start normal, normal being takes 1.5-2 secs to get to idle and the bump always occurs about 1 sec into it and then
it starts and idles fine. Looking for direction.

2004 5.3l