2006 Chevy silverado, remote start

I did a remote start in this 2006 PU yesterday and this was the issue. This was a valet 561r and I used a 555lw bypass for the passlock II. I wired up all the wires per the 2005 PU tech sheet. I saw that this truck had 3 ignition wires so I hooked up a relay to power up that wire during R/S. The bypass was hooked up per the directions. When I go to remote start the truck it cranks 1-2 times and dies. When I put the key into the ign and turn it to the run position then remote start it it carnks over and runs. I double checked all the connections of the 555lw and all seemed to be o.k. The truck starts fine with just the key. What did I do wrong. I got a reply that it was the tach wire that it need to be hooked up to the ECM and not an injector, I never heard of this so it may be possible. Or someone also said that it was the blue ststus wire that is not working but I do not see this as being the issue. Is this a passlock isuue or did I wire the main ign wire wrong? I am unsure so I turn to you guys for your input. I have done nemerious chevys with the passlock II but never experanced this problem.

Thanks in advance

Jeremy