Recently had head gasket renewal and replaced the valve seals. After this work my check engine light shows whenever the engine is put to load and car is running. This light doesn't come when the car is raced in neutral.The car has lost power and does not start properly, is stalling when hot. Yesterday we pulled out the spark plugs and found cylinder no 4 plug black... my injectors are fine...wires checked... don't know what the issue. Got a computer scan done it showed faulty ECT..had that replaced too... no use.

 

there s a youtube.com video on diagnosing a misfire on 6 th gen accord. good place to start, look for "scannerdanner"

 

Compression test it first.