* Description of the cylinder: What material is it made of (metal, plastic, etc.)? What is its size and shape (diameter, length)? Does it have any markings, numbers, letters, or logos on it? Are there any connections or fittings (threads, ports, etc.)? Does it appear to be old or new? Is it rusty or corroded? A picture would be incredibly helpful.
* Location in the trunk: Was it hidden? Loose or secured? Near anything else of note (spare tire, jack, etc.)?
* Possible explanations (with varying levels of likelihood):
* Part of a previous modification or repair: It could be a remnant from a past modification to the car's suspension, exhaust, or something else. Older cars often have mysterious leftover parts from past work.
* Part of a non-automotive device: It could be completely unrelated to the car – perhaps something someone stored in the trunk and forgot about.
* Something related to the car's original equipment (unlikely, but possible): While less probable, it might be a long-forgotten factory part or accessory.
* Something suspicious (less likely but worth considering): In extremely rare cases, it could be related to something illegal. This is less likely, but if it raises suspicions, exercising caution is always best.
What to do:
1. Take pictures: Detailed photos from multiple angles are crucial.
2. Document its location: Note where exactly it was found in the trunk.
3. Search online: Use your description (including dimensions and markings) to search online image databases (Google Images, etc.). This might reveal what it is.
4. Consult a classic car forum: Post on a Pontiac Firebird or classic car forum. Someone there might recognize it.
5. Show it to a mechanic: A mechanic experienced with classic cars might be able to identify it.
Without more details, it's impossible to say what the cylinder is. The information above should help you gather the necessary data to determine its identity.
