I swapped an E38 L96 6.0 into my 2011 Silverado 1500 (also E38) and copied over the applicable parameters from a stock 2500 / E38 L96 tune. On cold starts in warm weather the idle RPM overshoots greatly, then if the ECT is under around 40C the RPM will oscillate once I take it out of Park (issue is reproducible in R, N, or D). Sometimes the oscillation is enough to stall the engine. The attached log shows the stall around one minute after starting. Current tune is also attached. Typically the longer I let the truck idle, the less severe the oscillation / likelihood of stalling.
All the values in the current tune are either from the original LC9 tune or the stock L96 tune where applicable. Where do I start?