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That codes sucks, it's a random misfire on one of the 8 cylinders.

you got any other symptoms ?
-ALF out...
 

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well this can be the ignition coil .. or the opti ..this will create a 300 code.. this is your only issue ? if so then this may help.

did you drive it in a car wash ? drive thru deep puddles or heavy rain @90MPH ?

then that maybe the opti .. if not then the coil if 23 yrs old replace it.
plug wires can cause miss fires but not all cylinders miss firing .
 

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you didn't use Bosch O2 senors i hope ?

When you clear the code, does it come back after car warms up and goes into closed-loop or right away in open-loop when motor is still warming up ?

I would pull the plugs and see if any look fouled from rich or lean condition, if i did not know where to start.


-ALF out...
 
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