My OBD gives code for misfire #3 Cyl
And motor runs rough so something is a miss.

Remove old coil and spark plug
Plug appears dark on ceramic insulation The other 3 plugs are bright and clean on ceramic

New coil new plug
Same problem.same code .Runs rough.

I removed the coil pack and re-connected coil pack to connector with spark plug attached to coil .
Started engine and observed a strong spark.

Ran motor with plug removed and observed no noticeable elements of gas or oil mist, no smell ether.

Ran stethoscope "screw driver and my ear" on injectors all 4 and sounds like solenoid are open and closing.

Put 2 bottles of injector cleaner and 2 tanks of fuel
And same . Motor run rough.

I like to prove the problem before replace parts
Injector is my next move but if any one has any input Would be grateful

167k moles167k miles

Adjusted valve lash clearance. All good.
No change, motor run rough, OBD code # 3 cyl misfire
So injector is next ???????

Well back at it
#3 cyl 30psi
#2 cyl 60psi
other 2 cly approx 90psi
?
what to do, I want to keep car
so i’m thinking about pulling head and inspect cyl walls
for wear.
if not to bad maybe dismantel rod and pistons.
Manualy hone cyls and reinstal new rings.
x4
measure everything of course
192k miles
any advice
I am machinist for 40 yrs
re built 351 Ford windsor with succuss
But never any Honda
Dam thing goes down the freeway at 70mph smooth
You would never know it was worn out