2004 1500 Laramie 5.7L starts then stops

[Howser56]

Hi, I have a 2004 1500 Laramie.
When I use key it starts then a couple of seconds it shuts off. I have after market remote start installed right after purchased in 2004.
The only way to start and keep running is use remote start and put key in ignition and it's good. The odd time if key is used to start it will keep running.
Tried both keys that I have and same issue with both.
Anybody have any ideas what is wrong?

 

[jws123]

I would disable the old remote start if its from 2004 when that fails weird things can happen if thats not it take it to a lock smith have him check keys if bad replace.