Intermittent starting problem that rolls into a misfire

When I got my vehicle I replaced the spark plugs, cleaned the throttle body and took all the necessary steps to have the computer re-learn the new conditions. Lately though I have had these intermittent starting issues where the engine cranks and takes a few seconds to fire up then immediately rolls into what sounds like a misfire. The misfire clears as I rev it up a few times and then it runs fine. This used to happen more after restart following a hot soak. There was a service bulletin issued by Chrysler to re-mediate this issue by installing a fuel injector insulator sleeve on injector three. Their take was that the condition may be caused by heat from the exhaust manifold that following engine shut down migrates to the area around injector number three and causes fuel vapor to form within the injector (I did this step already).

This morning I experienced the same issue on a cold start, but the only difference was that the engine hesitated to start.

I get no check engine light. I have a small scanner and scanned the computer anyway but nothing came up.

Doing some research on similar problems I hear a lot of different opinions from leaky injector (due to crud), crank position sensor, O2 heater circuit, fuse, relay, faulty coil rail, incorrect gap on spark plugs etc.

It is overwhelming and I do not know where to start. I was initially thinking of adding a fuel treatment additive like Seafoam to the gasoline tank and see if that may cure the issue but I am not sure that is going to fix anything. The problem is intermittent so it is a bit more challenging to find the root cause. Any help in pointing me in the right direction. Thank you!