I swapped my 4L60E to a 4L80E in my 01 GMC Sierra. I am using COS 0202003. When I do a reflash its hard to get the truck started. It will crank and go to 1000 rpm, then die. It will do this 15-20 times. then when I start it the rpms will go to 2000 for about 5 sec then settle down to the desired idle rpm. can someone look at my tune and help me out. Thanks.4L80.tun