Originally Posted by
Frost
Spikes in the wideband look like misfires. Use NBO2 voltage to get down to the affected side (or look at the side the WB is in). This car needs a 2bar or ZL1 GM sensor and a boost OS; not a MAF. Then you can see belt slip or other boost related issues. It's not even done tuning and the MAF is nearly maxed out and you have another 1K RPMs to go (WOT part stops at 5600ish in log). Transient fuel, min mgs is an IPW lower limit; cut that value down to try and get it to clean up fuel at idle. Swap plugs; they maybe wetted up from fat idling. Use a dyno for spark (and fuel really); no car wants just 19deg everywhere at WOT. It will want more down low, and likely less up top.