2009 Tahoe w/ MagnaCharger

[dynoguy]

Any thoughts appreciated, 5.3L with the Magna Tune. Runs good, drives good. SES light comes on intermintently for a misfire, but it only blinks, wont set a hard code. Changed to two steps colder plugs and .028 gap. Had a code for cyl #3 for a while but that is gone now. Just the code PO300(engine missfire)

[SilverG]

Can you post your tune?

[dynoguy]

Thanks if you get a chance to look. I just disabled the DOD and the COT ..

[Mep_q8]

just thought i'd add to this... take a look at your IAT retard tables, and either change 'em to 0 or add +1-2 to them.. the colder air your IATs get, the less chance of detonation and the more efficient the maggie will be.. it'd be a shame to pull timing where forced induction shines most (Cold environments)

[firehawk26]

Any thoughts appreciated, 5.3L with the Magna Tune. Runs good, drives good. SES light comes on intermintently for a misfire, but it only blinks, wont set a hard code. Changed to two steps colder plugs and .028 gap. Had a code for cyl #3 for a while but that is gone now. Just the code PO300(engine missfire)

pull out the plug and cheack the gab on it again . and see if you have bad plug wire . log the miss fire cyl3 and see whats going on .