REPLACED. Plugs wires cap rotor intake gaskets and spider injector. still have p0300B. Cyl 3 and 6 are the main ones. Fuel pressure is about 55psi cylinder are in range of tolerance on compression. I need help this is my daily and I dont wanna just keep throwing money down the drain. Thank you for any help
99 is coming up to the year when crank and cam sensors were coming in stock on most engines. These sensors are more sensitive to others since they use electromagnets and sine waves to send back TDC signal to the ECU, rather than simpler binary data. With heat and age these sensors can fall off over time and send a bad signal for TDC even though every other ignition component is working fine. Have you inspected these parts recently? Test and replace with new OEM parts if possible.
@itaintright
Did the crank sensor. Not the cam sensor.
check the catalytic converter
@mountainmanjoe
Both have been replaced one less then a yr old other about 5yrs old. Only kicking the misfire code over 52mph. Even after doing the intake and spider today
you've done all the things I would have tried. Just have to start double checking your work. Sometimes parts have crib death.
Is the fuel rail maintaining pressure even over 52mph?
I would pull out each plug and visually confirm it's sparking