One misfiring
 

So, I went for a little drive in the A a while ago and she seemed like she lost a little power. When I got back I disconnected the spark plug connectors and placed them 1/8" or so above the contacts on the distributor cap. Three had a nice strong steady spark, one did not. #3 was not firing or only firing once every few minutes. I took the distributor cap off and cleaned all 4 contacts, not much better. Checked that the plug was tight no better. Any idea why there would be no spark (intermittent) to only one plug? Distributor cap bad, plug bad?

Re: One misfiring
 

Bad plug? no fire if bad.

Re: One misfiring
 

Try changing out that plug and re-fire

Re: One misfiring
 

Check the dist.cam for wear..

Re: One misfiring
 

bad cap, bad plug , maybe the spark plug wire is bad also, which might go back to the dist cap, good advice on dist cam, ive had one lobe worn so bad in a dist the points wouldnt open on that lobe, thurn engine over till #3 is on top of the lobe on #3 and see if the points are opening to secs

Re: One misfiring
 

Swap #3 plug with #1 plug and see if the miss moves to #1. If the miss is still at #3, then the distributor body is probably bad.

As mentioned check the cam first because thats the easiest and quickest.

Re: One misfiring
 

Thanks everyone, it was a bad cap! Fortunatly I am in NW CT and was able to run up to A&L Auto Parts for a replacement. Running fine!