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Re: 2004 Infiniti G35 with P0300 code. Please help
Posted to Technical Discussion Forum on 1/3/2019

install a vacuum gauge and see if it's bouncing.

Check fuel pressure under full load WOT.

Are fuel trims (total) within +/- 10 % at all RPM?

Do both front A/F sensors respond immediately and appropriately when forced lean and rich?

Do both rear O2 sens... Login to read more.