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Thanks for the input. I have ordered the pressure sensor 5006/5053 from a vender here in Newark . Seems like the best place to start. We changed the plugs last weekend because of the missfire code. A lot of carbon on the old ones. On start up test this morning the sensor was stuck at 0, then the...

P0300 misfires P0192 fuel rail pressure

2012 Mazdaspped3 running COBB stage2+ mods with COBB Nexgen Stage2 V450 tune. I have a video this morning of accessport showing fuel pressure dropping out a couple minutes after start up. This happens every morning on cold start. Then throws multiple codes and check engine light. Codes P0300...