Thread: Code p0300 misfire caused by cat?

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#1 Re: Code p0300 misfire caused by cat?
dsmuts

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09-04-2011

Pull the upstream O2 out and put a pressure gauge in it and see if it has any pressure. Shouldn't have more than 1-2 psi

98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
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