Hey there, My 1987 Harley flh police special is suddenly running really rough. It is popping at the spark plug end, I've replaced plugs and leads it's like coughing missing a spark or something like that. Not idling now unless the choke is on full, is this electrical or fuel. What should I look for?Any advice would help.

If the choke has to be pulled out in order for it to run, this has nothing to do with spark or a "coil breakdown" which isnt even a term, in other words, does not happen. Your issue is carburetion, you "pilot" jet or "slow" jet is plugged with debris or the bike has been sitting for a while and the fuel has jelled or become hard enough in the tiny jet that it won't allow fuel to pass at an idle. Remove the float bowl and inside the small tube you'll see a very small jet inside which is removed with a small flat blade screw driver. Once this is cleaned out, your bike will be back In good running order. You will be able to see a very small amount of light through the center of the jet, you can use one strand of a wire brush to plow through whatever is blocking the jet...... Hope this helps! If the choke has to be pulled out in order for it to run, this has nothing to do with spark or a "coil breakdown" which isnt even a term, in other words, does not happen. Your issue is carburetion, you "pilot" jet or "slow" jet is plugged with debris or the bike has been sitting for a while and the fuel has jelled or become hard enough in the tiny jet that it won't allow fuel to pass at an idle. Remove the float bowl and inside the small tube you'll see a very small jet inside which is removed with a small flat blade screw driver. Once this is cleaned out, your bike will be back In good running order. You will be able to see a very small amount of light through the center of the jet, you can use one strand of a wire brush to plow through whatever is blocking the jet...... Hope this helps!