like the topic says.
i installed it in the afternoon and start the car. SES came on and i drove it for an hour. it still on there.

reasons?
is it normal?
I have connected everything need to be in place.

any ideas?

 

It's not normal. Double-check the MAF sensor connection. If that's nice and tight then try resetting the ECU. Do a search for the how-to or just disconnect your battery overnight.

 

You probably didn't disconnect the battery before installing CAI and disconnecting MAF, hence triggering SES. Check the MAF and if it is tight, use this quick how-to for resetting it: http://www.technosquareinc.com/350reset.htm