I wanna bring this thread back to life due to it being the only thing even close to what I'm dealing with at the moment. I've got a 2006 swb 2wd trailblazer with a 5.3 and only 90k, I replaced all the plugs with oe acdelco iridium's, new plug wires, new throttle body, and tuned PCM. I've got a random misfire p0300 and it looks like it's on a few cylinders but it's just as described... It's random... And I can hardly feel when it happens and only feel it happening when it's at idle. And I have no other codes.
Cyl1:4516
Cyl2:1211
Cyl3:3996
Cyl4:1802
Cyl5:17435
Cyl6:1919
Cyl7:412
Cyl8:187
These are the current misfires as of the last 3000 miles. I have never felt a single misfire as a hard miss and it's only at idle.
