Engine vibration at stop light

[metro1998]

I have an engine vibration when in gear at idle (at stop light) if I put it in neutral almost all the vibration goes away. Once I'm driving there is no vibration, engine feels and performs normal. I have 96K on it. Please Help before I bring the car to someone.

[Invective]

I have an engine vibration when in gear at idle (at stop light) if I put it in neutral almost all the vibration goes away. Once I'm driving there is no vibration, engine feels and performs normal. I have 96K on it. Please Help before I bring the car to someone.

My car is coming up on 48k miles and recently had the original plugs changed out. Compression checked out. Slowing to a stop or stopped I have to check the tach to make sure Marauder is still operating - it's that smooth (and quiet). Has a 'nervous idle' (slight shaking) in Park or neutral but firing evenly. Motor purring at tail pipes. Marauder does operate and idle better with 'no ethanol' gasoline. Ran well when I bought it at 39k miles but noticed that after 47k miles the idle quality was deteriorating - not as smooth as before - no codes or CELs. New plugs restored idle and lost performance I wasn't even aware was missing as the process is very gradual. Let us know what you find.

https://i.imgur.com/kpgwkuil.jpg

[Logan86]

I had surging idle at stop with the AC on and changed out the throttle position sensor and idle air control valve. Fixed it right up. I kinda just threw parts at it though so you may not need both, hell you may be able to change plugs like suggested above and be good

[Dragcity]

An underperforming coil can cause that. I had a slight miss at idle at about that milage. I replaced all of my COPs and plugs. I'm supercharged and drive it hard so I just upgraded everything at once.