At a stop sign I need to put the car in neutral to keep it from jerking and idling rough. There is a popping or backfiring that comes out of my afm when taking off from a stop. It is worse right now due to the gas additive that is out. Also for some unknown reason I have had 4 out of 6 sparkplugs break off at the tip inside of the plug wire, ever heard of this. This car has a lot of problems.