well i was just wondering? isnt it when there is alot more air than fuel in the mixture? because on my A/F meter when i down shift in any gear without feeding more gas it goes completely lean on my gauge. i would think this is norm, but i jus wanna make sure nothing is beiing harmed. also at idle my AF is all over the place from lean to stoich then rich constantly changing. is this norm too ? its a 97 RS 5spd. just intake , exhaust, and 75 shot Zex kit which i barely use. (results were without use of nitrous)

91 civic hatch, homemade turbo+ LS motor = 12 sec street car.