Step by Step for SD tuning:

1: Unplug and replace MAF with a strait bellows (less airflow dispruption creates a better VE)
2: Disable the SES lights for MAF codes P0101, P0102, P0103 (No check engine light.) Do not completely disable the codes or the PCM will not fall into SD mode. Only turn off the SES light, DO NOT DISABLE THE CODES THEMSELVES!
3: Change all points to 1.13 in the Open Loop F/A vs ECT vs MAP table (commands AFR of 13.0)
4: Change all points in the Closed Loop Enable Coolant Temp vs IAT table to 250* (Disables closed loop)
5: Copy High Octane table to the Low Octane Table (computer reverts to low octane table when MAF is unplugged, this assure optimal timing)
6: Change all points in the Power Enrich Fuel Multiplier vs RPM table to 1.0 (disables PE mode)
7: Use wideband to verify AFR of 13.0
8: Make adjustments to the VE table accordingly to dial in a 13.0 AFR (a lot of driving or dyno time)
9: Hand smooth VE as described by Magnus (a smooth VE results in crisper throttle response)
10: Change all points in Open Loop F/A vs ECT vs MAP table back to stock (re-enable stoich commanded AFR)
11: Change all points in the Closed Loop Enable Coolant Temp vs IAT table back to stock (re-enables closed loop operation and fuel trim leaning)
12: Change all points in the Power Enrich Fuel Mulitiplier vs RPM table back to stock (re-enables PE mode)
13: Use wideband and PE table to dial in desired WOT AFR. (optimum HP at WOT)
14: From here you can now plug you MAF back in (you might not want to since it will be running so good) and you can begin to modify your MAF table to get your trims back in line with what you were seeing while in SD...(More on this later.)