check your timing and your IAC....it could either be your startup AFR being off because weather is getting warmer or it could be that you may have to mess with the timing at startup a bit. It's probably about time to start on a good summer tune though.

__________________
GreenBastardPerformance2000 GTP Coupe (the green bastard)
XP, Pacesetters, LS1 TB & MAF,MSD System, P&P LIM, P&P GenV w/ 3.2, 3.0, 2.8, Devil'sOwn Injected 100% Methanol,PowerTuned, TripleEdge Trans w/3.29's
12.92 @ 105mph