I had a somewhat similar experience, although on the Chevy side. It sometimes took a bit to start and was rough on idle until I goosed it a little. It ended up being the fuel pump. After it sat for a bit, the fuel pressure dropped and it took a while to get it up again. It ran great after the the initial start up and goose. It would even start right back up fine. Not that you want to just go throwing parts at it, but that's what mine was. Also, K&N are actual garbage. I learned this running quads in the dunes. Use a stock paper filter.
