I recently bought a 2001 Cadillac Deville. Lately it has began accelerating when my foot is not even on the gas. Like the accelerator is sticking or something. Although the gas peddle is NOT stuck. Also, it won't start when it's hot. I believe it's something to do with the fuel? I used a diagnostic machine and it said "Glow plug circuit" problem. If you have ANY insight as to what this might mean please, leave some feedback.