has anyone re-tuned a vortec engine running tbi with success to run good. my setup is a stock vortec 5.7 i have a open 4 barrel intake with tbi adapter plate, headers y pipe and no cat with a basic aftermarket muffler. what did you do for the spark tables? my ecm is 7427 bnkm code, 5.7-4l80e combo. i have the fuel basically figured out a bit rich right now but i figure the spark tables need adjusted before i go any leaner on the mix. all sensors ect.. are brand new right now with all the tbi free mods and adjustable fpr inline, high flow fuel pump blah blah blah all the regular goodies done. i have a moates apu1 to do tuning ect.