Anyone ever see this issue? I have a 92 c1500 that I did a complete swap to a 99 Tahoe 5.7 vortec... harness & all over a year ago & no problems. It was running perfect yesterday & today I get in & try to start it & it sounds like it’s 180 degrees out of time. Any ideas would be greatly appreciated... I did check all fuses & it will connect to my scanner... but gives an error when trying to pull codes