So the 5.3 Chevy got to do a dirty job because my cammed crew cab 454 99 isn't tuned yet.. It handled it like a champ especially since most of it was done with a pretty good headwind, but after a few hours on the highway it got a nasty miss and hesitation below 2500rpm. I guess I am looking at a few easy things right now.. Plugs (already have ready to go in), wires, clean IAC, try a different MAF, fuel injector cleaner, coil packs (have some known good that I can try).. I hate diagnosing engine stuff like this but this stumble/miss is VERY pronounced when you have a load on like this.
The trailer is a 26' + 5' beaver tail tridem single. The truck is a 99 7.3 zf6 eclb dually. Guesstimating 8500lbs or truck and 6000lbs of trailer. Of course it wouldn't start so it had to be pulled on with a chain and hi lift jack.
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