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Discussion Starter #1
In the morning or when the engine is cold I'm having misfires. This started 3 weeks ago and I changed my plugs 5 months ago with the timing belt. When I crank up my trep it will idle bad but when I step on the gas it will run fine for a min when idling then start running bad. It smokes alot also. When it's at normal operating temp it rans fine and the smoking stops. I pulled some codes that which was P0300, p0303, p0420, and p0430. Think my O2 sensors are causing misfires?
 

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get off my lawn
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id suspect,, just from what you wrote,, leaky fuel injectors,,, smoking upon starting,, black smoke, is raw fuel,, it will also throw the 2 converter codes you have, Po 420-430,
 

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Discussion Starter #4
I'm using platinum NGKs. Can't find Champions anywhere anymore. That leaking fuel injector might be why I'm not getting good gas mileage now. But will it cause a misfire and just stop when the engine is warm?
 
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