Hearing a little pop and can slightly feel at feet.It mostly has happened around 30mph but now occasionally happens when idling. And at 55 mph and higher nothing.have replaced plugs, wires and cap 5000 miles ago. Tried to have mechanic look at but they couldn't appreciate the noise.

 

Of course not. Big as soon as I was done it started up again.

 

People seem to get this all the time if they don't use delco cap and rotor. Do you remember what you put in?