2005 s40 P0300
#1
#2
#5
as long as you have the right plug temperature range and gap, there shouldn't be an issue. As a next step, I'd look at the intake - did you install a new stock air filter? is the MAF clean? throttle body clean? Next I'd look into the fuel delivery system - fuel filter, relay, pump, check pressure at the rail. Anything about the randomness? ie at cold start up vs after a long drive? does it happen when the gas tank is on E vs F? How many miles on the car?
#7
I have heard and read that some misfire issues do come down to not using volvo oem plugs on this particular car. I have my personal doubts about this but there are a lot of threads out there that suggest this.
#8
There is one review for these plugs on Amazon that says new AC Delco double platinum plugs had cracked insulators causing a misfire, so there's that.
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