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Good evening and welcome to JustAnswer!!
What is the compression of the cylinders? Is the check engine light on and what codes are active? Being it's a HEMI you the ETC which is Electronic Throttle Control(Fly-By-Wire) and it may need to be relearned... Will it stay running if you give it throttle?
Thanks for the reply!!
I see you said your learning... And did you rebuild the engine yourself as in disassemble and reassemble the machined parts and installing rings on the pistons and such?
And a good compression for a rebuilt engine is around 150+ and I'm hoping that you do have good compression and it's a throttlebody issue.. Because if it's low on compression you will need to first make sure it's TDC and if not then you likely have bent valves but let's get the compression checked and go from there..
If you will just do a compression check first and let me know the readings so I will know if it's internal or not... I'm hoping is just a ETC issue and if so do you have access to a Witech scantool to relearn the ETC? It will have you press the accelerator and hold it to learn the values.
Keep me posted,
I've only ever used OEM dealership scantools so I'm not sure if any aftermarket scantools will relearn it but test the compression and let me know.
Have a good one,