i have and lq4 4l80 i just swapped into my 1987 c10 and i got it up and going and i have driven it over 100 miles with no issues, but now it seemed like it had a miss so i hooked up the vcm scanner and my stft were going crazy crzy high when i put the engine under load. its got speed engineering mid headers with a 3 to x pipe to 2 straight through mufflers. i can upload my log file but any help would be appericated!!21-07-24 16-53-52.hpl
Check for exhaust leaks by the o2 sensors and check your fuel pressure.
Checking for vacuum leaks too would be a good idea as well.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
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