So, my truck recently developed a bit of a hiccup. When in park at idle, truck runs smooth, starts fine too, when I rev it in park, it revs up fine, and normally. When I put it in drive or reverse, it idles fine at first, but the second I put it under load by trying to accelerate forward or backward, it starts running really rough and acting like it's not firing in at least one cylinder, and this continues even at idle once I've hit the gas once while in gear, goes away again once put in park. If I drive up the street, and put the shifter into first, the truck bogs like this until about 2,500 rpm, then it starts running fine. The truck just got a new distributor cap and rotor, and new plugs just a couple months ago (didn't replace wires as they were still in very good condition), and new plugs again just yesterday. But it's still doing this. I thought maybe injectors, but each of them is clicking away while it runs, however one does feel weaker than the rest. Could this be my problem? Or is my coil maybe on the way out. Just looking for some suggestions

 

No worries guys. Went out at night, and watched the motor with no lights and noticed a wire was arching on the heat shield. Changed wire, problem solved