The other day I started my car in the garage and it started abnormally. After starting, the whole car was shaking and the engine sounded as if it might have been knocking. I don't personally drive the car that often, but it is driven at least once a week, usually more often, and this has allegedly happened once before, a short time before this. After it started, I pulled it out onto the driveway and let it idle to see if the noise would clear up. After a minute or two, the noise disappeared. I took it for a short drive and it drove perfectly normally, without any strange noises or hiccups. It currently has somewhere around 78k on the odometer. Does anyone know what could be the cause for this odd starting behavior?

 

reset the ecu or just the EFI fuse and see if it still happens, ive seen it happen to some camaros my friend had and the problem went away after a reset.