I'll have to agree with jeff on the fact that these trucks did come with a nissan engine and on the plugs, all nissan engies come with Denso (nippondenso) plugs in them. NGK plugs may work but they are not OEM plugs.
As for the sensors for the crank and cam i also agree they should be replaced as a set, and if at all possible try to use OEM replacement parts. And to add to any errors that throw the POS cam phase or crank codes you might want to check the EGI and main C relays, they can also interrupt the signal for those sensors and cause a misleading error that will run you in circles and replacing parts that don't need replacement.
just some facts to consider while troubleshooting :o)