What do you mean by skipping, jumping timing, or running rough, has motor been pulled apart
Running a little rough. Then eventually it started running so bad I couldnt hardly keep it running. I heard the engine run before I swapped it but only for a very short time since it didn't have any coolant in it. I can't say for sure if it was skipping or not. Honestly I wasn't paying attention to that, guess I should have.
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DD - 2013 GMC Sierra SLE Ext Cab 4x4 5.3
Beater/Crawler - 1982 Shortbed Pickup: 3RZ swapped, 4x4, Bobbed 8", 5.29's, IFS rear w/chromoly shafts and Grizzly Locker, Spartan front, 1.5" spacers front, 35x12.5 MT/R Kevlar, hi-steer, '79 grille & headlight swap, half doors.