PO300 after cap and rotor change.

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B-train

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There were a batch of bad OEM distributor caps that came out over the last 2 years or so. I replaced a bunch for corrosion on brand new kohler generator engines. PSI makes them, but they are GM 4.3, 5.0, 5.7L motors and the V8 ones had the issues. I'd just replace from a good vendor. Try VALLEYPARTS.COM

They seem to have the lowest OEM stuff online. I also agree with the spark plug input from other members.
 

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