Recently when I step on the gas, gently or not, the vehicle feels like it's jerking or pulling to get up to speed. Now at times when I step on the gas, it doesn't go anywhere until I let off the gas then press gas again then it jerks forward dramatically. Even when I'm at a stop light or stop sign it speeds up randomly when I'm not even pressing gas. Any idea what's going on? I researched on Google and it suggested cleaning the MAF sensor and it did nothing.