I have been having a hesitation off the line with my ls automatic... It happens during the 1st 10ft.
Any suggestions????
Tranny???
ECU????
IAVC????

 

Well from my experience I can tell you this.

It's an LS. There is no torque the first 10 ft.

 

This is not a sure answer, but you could check your shift solenoid, have had a few doing the same thing, took out the shift solenoid and applied power to it, i can still hear a click but not as strong compared to a "new" or a "known good one". like i've said, i'm not so sure, but a new one will fix that problem 90% of the times.