It's throwing po300, po446

First one is random multiple cylinder missfire. The second is a even emission control system vent circuit malfuction.

Anyone know what could cause these. When it's cold you have to crank the crap out of it for a minute or so before it will start. Some times it won't start period.

 

Is it only when the motor is cold or everytime you try to crank it even after the motor is warmed up? Im tracking down the same issue with mine.........https://www.performancetrucks.net/fo...-crank-523782/

 

have you guys monitored fuel pressure? p0446 will not cause your truck not to start. -Ray

 

I have mine. I've got 50psi running which is within spec. I even put in a new fuel pump and filter for the hell of it.