I have a 92' Accord fully loaded
I changed my sparkplugs
I tested and ensured full function of ignition coil and even set my timing precisely.
Also changed ECT sensor.
The only problem is that the engine misfires at around 40MPH at around 1600RPM. It hesitates noticeably.
and only does this after a bit of driving. And after it starts to misfire, it idles rough at red lights.
There are no DTC codes.
Just replaced O-ring at distributor but no fix.
and also replaced the valve cover gasket.
It starts up and runs nicely.
What could it be?