Engine Performance problem
1995 Mercury Sable 6 cyl Front Wheel Drive Automatic
After about an hour and a half of driving, the engine starts to shudder and then starts stalling. Sometimes there is also a smell that will come through the vents that smells kind of like burning rubber. On occasion it will get a boost and be okay again for a couple minutes. I think it is the fuel filter or fuel pump. Where are each of those located and what are your thoughts on anything else it could be. Thank you.