momentary lean dip at small throttle changes

[BIGDUMBGOOF]

hello everyone,

i get a momentary lean condition while increasing throttle position.
example lets say i'm cruising at 500mbar at 14.5afr @ 10% tps,
when i give it +-20-50%tps it goes to lets say 800mbar and the afrs gets to 16.0-16.5 for a second, and after that second it goes back to the afr's i tuned it to,(14.0 afr)
i tried increasing tip in up to 55% (but it didnt help the lean spot, just made it richer for a second at WOT,
when i give it full throttle i dont get this lean dip,
what could it be?
i also noticed that while cruising at very low throttle position (1%-2%-3%) afrs gets rich 13.5-13.8afr and it seems that what ever i take off the maps wond help this rich spot,


setup is:
s300v3
id1000 at 43psi no vac
gm 3 bar,
stock throttle size.

i attached the map now but i will have a datalog in a few days, (my wideband offset is too high and i need to sort it out)

[BIGDUMBGOOF]

Forgot to mention, (no exhaust leaks ,no vac leaks ,no cels. iat and ect stay constant)
thanks

[Spunkster]

Post a datalog showing the issue.

[Johnny_9]

Does the next S300 version need tip-in fuel enrichment by RPM?