Hey I'm new to the forum but I heard this is the place to go with Fiero questions. I have a 86 GT 4 speed that I bought rebuilt at 120k and now has 140k. The car has been great until I had to drive it to Rochester where I moved. It made the 300 mile trip but when I stopped for gas about 150 miles in I heard a strange rattling sound that echoed through the shift console. It sounds like a bearing or piece of metal bouncing around on top of a spinning metal plate. (Think of roulette only with a piece of metal for the ball and a metal plate for the wheel). It only happened when I shifted and then continued until I reached 4th gear. Clutch position didn't matter, it would make the noise with it depressed or not. Same with the gas and brake pedals, no difference in either. Even in neutral it would make the noise. It got worse as the trip went on, so when I finally got there I just let it sit for a few days fearing the worst. I started it up maybe 5 days later and shifted into gear and no noise. I test drove it and it seemed like there was nothing wrong. So I continued to drive it once a week or so. Then out of nowhere after a rather short (30 minute casual drive) the sound returned. Again it got worse the longer I drove so I let it sit for a few days again and it went away. My other car needed some work so I was forced to drive the Fiero and it seemed fine on short trips but if it drove for more than 30 minutes (regardless of how often I used the clutch) the noise would return. Now I'm back in my home town (another 300 mile trip) and the noise returned on the trip. I've searched around and heard about input shaft bearings going bad but the noise that makes goes away when the clutch is depressed and heard it wouldn't matter if the car sat for weeks the shaft bearing noise would start as soon as it shifted in gear. Also heard it could be the throw out bearing but it doesn't make sense that it comes and goes. I'm fearing the worst (transmission rebuild) but wanted to see if anyone had any suggestions.