2
questions

why abs brake system sometimes vibrating, and much less pronounced in the brake

My 500 E misses severely to the point that it is now hard to get going when it is not driven for a few days. Initially, it runs OK, but if parked and then restarted, it misses severely. If I drive it daily, it runs smoothly. I have had the plug wires and plugs changed. It acts like it is not getting air or ? fuel. ? computer problem?

Thanks