Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Not that I would ever condone putting bulbs that put out 2x-10x the light output into the same housing, it sounds like you could use some capacitors. The LEDs should be using significantly less power than a halogen ever would. Maybe there is a quick dip in voltage as the engine turns off? This sounds weird...
If yours are flickering at other times other than ignition after start/stop, then yes, you will need capacitors. What make of LED bulbs are using?I hate the flicker too! Please let me know if anyone has a solution with capacitors. I notice it upon starting up at a red light or somewhere the auto start/stop functions. I went with LED bulb swap out as well and would love to resolve this.