Not all, it was an option.
Yes, as are all the Sunfires.
Yes, a six cylinder engine was never available in any model year of the Pontiac Sunfire.
See stvndberryhill's answer under 1998 Pontiac Sunfire horn relays. This answer applies to all year models of Pontiac Sunfires.
All 2002 Sunfires, 2.2 and 2.4, had timing chains
all Sunfires are 4 cylinder engines, so 4.
Probably. I think that all the Sunfires had the split folding rear seatback. But don't quote me!
My reference web sites list the capacity for all Sunfires as 15.2 gallons US. FriPilot
No
Yes. All sunroofs both factory and aftermarket have drains because it is impractical to totally seal a roof opening.
Yes. All Preludes do.
99-2005 Grand am and Olds Alero. They both share the same chassis and all parts will fit.