Ok - I recently got the random misfire and have basically tried everything and no luck! I also have high Fuel trim in only Bank 1 but no code for it is coming up.
Random Misfire P300
High Short Term Fuel Trim on Bank 1 (+25%) when idling (Bank 2 looks fine)
High Long Term Fuel Trim on Bank 1 (+10%) when idling (Bank 2 looks fine)
What I’ve done:
Checked compression - All 6 cylinders report around 180psi
Replaced all 6 spark plugs
Replaced all 6 coils
Replaced all 6 fuel injectors
Replaced Fuel Filter Module
Replaced Upstream Bank 1 O2 Sensor.
Replaced intake manifold gasket
Visually inspected for vacuum leak.
What else can I do? This has been a headache for almost 6 months now and finally gave up. Any help or guidance would be much appreciated. Will even send money for beer if it points me to solution.