So i have a 2003 miata with a p0012 i changed the sensor by the heater core changed the vvt sensor still nothing thinking it might be the phaser cam geat vvt actuator

 

Check the timing, the belt may have slipped a tooth.

 

Ok ill check im rebuild the phaser cam and adjust the timming. Is there a video i can watch on how to do and where can i get it anybody know please help

 

There's loads of videos available on youtube. I'd probably watch FM's and TheCarPassionChannel, personally I learned from a haynes manual, which are ~$20 on amazon. I like them because they list torque specs. Get a quality torque wrench, and unless you're in a giant time crunch, replace the water pump, valve cover gasket, front main seal, cam seals, thermostat, and water pipe o-ring while you're in there. Get a metal water pump gasket only, and I use black RTV for water pump inlet and thermostat sealing surfaces. I hate the possibility of damaging the crank or seal when installing, so I use FM's front main seal install tool, they also have a crank holding tool for easily setting the crank bolt to the factory torque spec of 122ft/lbs.

 

Thanks so much i feel dumb of course just ored the book hope it will tell me in there tank again