Hey guys. Working on cousins sled. Got it running good after cleaning carbs and new fuel line and screen in tank. Idles and starts perfect. But I have an intermittent bogging when going fast. I found that if Im running and it’s going find then starts to bog, if I stop and jiggle the coil and wires it runs great again for a bit. Took plugs out right after this, one looked great, brownish color. The other one the ceramic was nice and brown, but was visibly wet. I know for sure it’s not a fuel problem. Do these coils go out fairly easily or could it be a simple plug and wire replacement? Also, what are the correct ngk plug number?