need help Bad-excuse me for being stupid

well I put the Autolite 85 plugs in here the other day. changed the carb out with the Thunder series 650 carb and I liked the way it ran. lot better low end torque. thought I was set. Left this morning to go to the car show that was about 25 miles away and just before I got to the show, I noticed the car had what felt like a vibration. A kind of a shake. I noticed when I got in it a little, the ping returned a little. It feels like there is a problem with the plugs not firing right. maybe I have a bad one. any ideas. some say the Autolites are junk. some say their Mopars does not like Autolites. change them. maybe I have a female Mopar engine and she is very particular. Go back to the long reach champions that I had it it, RV12C. Maybe go to a short reach Champion RJ14yc. any suggestions is welcomed.