Cold Start

LS1 5.7 HSV with :? Whipple supercharger.Cold start?Fires up ok but then staggers for say 30 secs until it settles into nice idle.If the throttle slightly opened the idle will be ok and settle out after 30secs.
Have been around EFI tuning parameters in idle,cold start etc,etc, with no success.What am I missing out on.After first cold start thereafter starts perfect.
When at operating temp a slight opening of throttle produces a slight uneveness at say 0to4%of throttle opening and then clears.
Anyone got any ideas fo a guy in UK

Moved to Tuning Forum
Paul

have you messed with the BASE spark tables?

Not altered Base Spark at present.All cells are posted at 20 deg.
Where would you suggest I start?
Thanks for input :?

??? 20 degrees? send me your file, ill set you up with a starter file for your mods.. jessebubb@yahoo.com

Wait 4 me/ Thanks for that,I will mail you file shortly.