i have a 87 nissan 4×4 truck and 4 cylinder z motor. truck had a lot of miles on it nad was missing really bad

i put new plugs in and installed new timing chain and tensioners. truck stills misses and idles rough. has popping noise in caburator. dont know what to do to sove problem. i also tried to set timing and still running rough. do i need a new head or what?

Torque all the studs on the head. The heads might have loosened over time and if the heads aren’t torqued to precise tolerances it may run rough and have less power.

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