please help i have several days searching the fail.
the car was ok i made the tune a couple of years ago
i change sparks, oil, oil filters, and cleaned TB and iac valve
then starts to fail
so i changed iac valve and O2 sensors ac delco
sprayed for vacuum leaks
cleaned o2 sensor connections
check for exhaust leaks
no changes
Probably had it tuned with a gunked up IAC/TB.
Your IAC is completely closed.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
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