Seeking help. I’ve read some threads on here about a similar issue but I haven’t seen a resolution for this issue. I have a 2001 2500hd 6.0 that is having a no start on the first key turn. It just turns over. The second time it will start every time and run just fine. I didn’t have this issue until I removed the intake to replace the knock sensors. I used new intake gaskets, new knock sensors, oil pressure sensor while I was in there, and the replaced the ERG gasket. Once I reinstalled everything this issue started. In trying to figure this out I have replaced the fuel filter, fuel pressure regulator, and fuel pump ( twice). I had it in the shop and they told me the sensors weren’t all communicating, so they relearned the computer and told me it was fixed. But it’s not. I also have found no vacuum leaks. Can anyone please help me I hate this and just want my truck back to normal? I bought this truck new so nobody else has ever done anything to it but me.