I have a 99 dodge ram 360 sport. I've had a problem with it running rough for a year now. i would call it a misfire. when its in park it will eventually shut off. it will start to shake like its out of gas. I get an awful smell. If the heat or ac is on it will shut off then truck will minutes after. i replaced the drivers side heard (had a burnt valve and was told it wouldn't seat right), sparks plugs, rotor, cap, fuel pump with fuel filter, 02 sensors, completely new dual exhaust from head back including cat. im probably missing some. a friend of mine unplugged 4 of my fuel injectors on drivers side and my truck started up and ran the same. i have no check engine light on. I'm confused!!!!

 

I also replaced 7&8 injectors