Truck just started to have a slight miss at idle and part throttle. The fuel gauge and volt gauge are moving around like a slight bounce back and forth. I just installed my new electric fans and nelson harness. It was doing it before this so im not blaming them or thinking they may be the prob. The ac has also been acting funny so it seems to be an electrical issue????

I did just install a new set of ngk plugs. Wires are prob 300k miles old.

Im just looking for suggestions fellas. Im unsure were to start.