When i went from stock os to the EFIlive Cos3 2bar tune.
When i reflash my truck it will run for sec than die. I had to do this two or three times befor it run on it's own. Do need to do a crank re-lean after you do this or this comman thing.

 

when you do a full reflash you need to do a CR..
Mine did that but i had some stuff wrong with the tune.. haha

but i have flashed a tune on there and it would idle for a second and choke out.. finally it took the tune and its all good now.. theres some strange things you will see messing with computers

 

I just changed over to COS3 and mine did the exact same thing. Grab another tune online and compare all the tables and parameters. Some of the stuff did not crossover well when I did the reflash so I had to fix it.

 

Post up your tune, I bet you have a couple of parameters that are out of range, also check B3647 and make sure it does not have the values (B3605) the previous stock os had....

 

Dc Justin set up my tune so really don't think there is anything wrong with the tune. It only does this when I flash or update some stuff like updating my VE table.

 

after i would correct my VE table, then reflash mine would barely run. Sounds like Idle trims to me. have you ever done a RAFIG.

 

Gotcha, he knows his stuff... I was just stating what happened when I converted over to COS3... Do what charcold-bowtie said, do the RAFIG/RAFPN procedure, sounds like your fueling is off in the idle areas...