rich1223

i recently had the ECU replaced on my 99 max SE 5 speed by Nissan.My question is with the old ECU when i stepped on the clutch or put the car in nuetral when comming to a stop the RPM's would would drop and sit at around 1000-900 rpm's for about a second or two and then dip down to normal 550 to 600 rpm's but ever since the new ECU was installed the car wiil do just the opposite it will go down to 500 rpm's for about a sec then back up to the 600 range.Is this normal?or was the other ECU acting correctly?Please note my car is a Cali spec model.thanx