Hello

First time here. I need help trying to figure out a no-code misfire most noticeable under very light acceleration. 06 dakota 4.7 4x4 with 300 000 km.

Things I've done so far:

Ruled out cats  using temp gun, vacuum test & disconnecting the exhaust. Changed plugs from autolite to champion. Cleaned throttle body. Changed air filter, MAP sensor and AIC valve, fuel pressure checked ok while driving and misfiring. Cleaned injectors and tested resistance. Checked resistance of coils. Checked for vacuum leak by spraying throttle body cleaner on air lines and intake manifold. Plugs are very clean and vacuum reading at 22. Idles at 750 when in gear and 900 in park. Very rarely I get p0300 code and run a little rough for about a minute when engine is cold.

Any help would be appreciated.