Up until two weeks ago, I've had no major problems with my 2007 ZX-6. I keep up on my oil changes and other very basic routine kind of maintenance. So, here is my story/cry for help:
Two weeks ago I just rolled over to 18K, as I was pulling into my house, after riding home from work; my gas light came on, but I figured I would get some gas in the morning before I got to work. The next morning, as soon as I started up my bike, I could tell that it was idling very strange (RPM's were a bit jumpy while idling, and it just sounded off to me). I didn't think too much of it, and decided to ride it into work, like I normally do. As I was riding, I noticed that the bike would completely fall on it's face when I gave it gas, and up until about 4k RPM. It would them collect itself and accelerate like normal. Every time I would come to a light to a stop, the same thing would happen: bogging down, sputtering, but not every stalling out.
I tried adding some SeaFoam into the tank to see if that would help - it didn't. So, I took the tank off, pulled the fuel pump out, and drained all of the gas. Filled it with new gas, but still no luck.
I changed the spark plugs on it (first time ever after 18K of riding; way overdue, I know), hoping that would possibly be the cause. It ran really well after doing that for about 4 days, and I figured I had fixed the problem. Went for a longer ride yesterday with no problems at all. As I was pulling into my subdivision, my gas light came on, but I chose to just park it, and get gas in the morning.
I go for a ride today, and it's idling weird again. It's not falling on its face like it was before, but it definitely sounds sputtery again, and the idle is bouncing. I have attached (hopefully; this is my first time posting here) a few videos to show what the RPM's look like as they are bouncing, and how the exhaust is sounding.
Does anyone know what could be the issue here? I do notice that the problem occurred both times with low gas over night (possible condensation?), but it's not the only two times I've had my bike sit for less than 12 hours overnight with low gas.
Any help is greatly appreciated.