Intermittent Idle issue

[Cakeworx]

I have been experiencing an intermittent issue when I idle lately. Typically the 328i hovers in the 600-700 rpm range but occasionally it will drop to 400-500 and it is fairly violent shake to the car when this happens. Is this a misfire in the cylinder?

In the past I had an issue where I had to give the car some gas pulling out in traffic (ATL always traffic) and when I came to the next light there was heavy vibration/sputtering. I pulled over turned the car off and back on and it ran fine. This has happened 2-3 times in the past 6 months so I am hesitant to run it above 4k rpm now. I don't know if these two issues are related. Any advice?

[White94RX]

Any check engine lights or stored codes?

[Cakeworx]

Check engine light came on during the event with sputtering but it went away as soon as I shut the car off and has not come on until it happened a few months later. I don't have a scanner for codes. Is there one that is recommended?

[White94RX]

ISTA is BMW dealer level software. I've heard good things about an app called "Carly" but I have no experience with it. A good BMW capable scanner is absolutely vital if you plan on doing your own repairs.

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[White2011]

I have Carly and love it, it isnt cheap at first but once set up and going you can scan and code the basics. I hate to say it but Auto Parts stores can scan, they arent indepth but can usually get you a code. WHen I had a misfire I went to autozone and it showed a misfire code on there cde reader.

[Cakeworx]

Thanks for the help and advice.