Burning Smell Near Passenger Firewall

[vin92sc]

Hi everyone Im a newbie. Please help. I have a 92 sc400 with about 122,000 on it. Recent issue when after I do highway drivng and then come to a stop. I notice smoke coming from under the hood near the firewall on passenger side. I popped the hood and there is this big rubber boot thing attached to the firewall and i actually could see behind it. And it looked red like it was heating up. I guess that explains the smoke and smell of rubber. Does anyone know what that part is? All the gauges etc stay in normal mode.I can try and take pics and post what the part is. As everyone can tell im terrible at typing and trying to explain things . thanks

[grnsc40095]

A picture of the area, of concern would help. Have you done anything recently to the engine bay, cleaning with chemicals?

[UCF3]

Yeah, upload a couple of images so that we can look to see if it's something vital.