yeary03SS

Ever since I put on the supercharger i've had trouble with open loop. Sometimes it hesitates and stumbles when moving from a stop when the engine is cold and hasn't reached operating temps yet. It does not do this in closed loop (which is why I don't think it's a fuel pump or fuel pressure problem) and never did this before the supercharger. Anyone have any ideas? Should the egr be open or closed during open loop? I'm asking this because I once got an insufficient egr flow code thrown, so maybe the valve gets stuck closed sometimes. This occurred with the original superchips programmer that came with the kit and is still there with Allen Nelson's tune. I'm totally stumped since I don't have any scanning stuff and it only does this some days. The last thing I can think of is maybe it's trying to go into closed loop too soon (I have a 160° thermostat)???