Need some help with Codes please 08 6.4

[Comet1966]

Started the truck this morning and got 2 codes
p0300 random miss fire
p0266 cylinder contrib fault

where should i start here?

2008 KR 182k
no tuner, no deletes, all stock
thanks in advance for any and all help!!

 

[shaft850]

Started the truck this morning and got 2 codes
p0300 random miss fire
p0266 cylinder contrib fault

where should i start here?

2008 KR 182k
no tuner, no deletes, all stock
thanks in advance for any and all help!!

Comet checkout this link http://www.engine-codes.com/p0266_ford.html. I would start with making sure my connections are good look for wiring issues no bare wire on the harness next step would be to either clean the injector or try a good quality cleaner. Clear the code and see if it comes back...