OH NO celica won't turn over, advice needed Options

[uberschall]

hey everybody. i'm in a bit of a hurt and i hope somebody can give me some insight.

my 5sfe didn't start today. i've NEVER had a problem with it before. the starter runs but the engine won't turn over. it's damp and rainy today, for what it's worth. it has a full tank of 91 octane, the battery connections are tight, and all the plug wires are connected properly.

with the gracious help of my neighbors, we tried push-starting it several times, but as soon as the clutch pops, the engine makes a horrible diesel-decompression sound and the tires just skid (maybe because of the wet ground)

i'd like to replace the plugs, wires, coil, dizzy, etc. but i'm hoping someone can help narrow it down. i will do my best to provide any additional info if needed.

thanks.

[uberschall]

the only thing i know so far is that the problem is intermittent, and seems to be directly proportional to the time of day/humidity. it didn't start yesterday morning, but i got it running around 2 pm.

i drove it to my parents house and back (30min, no trouble) and to and from class (parked for 4 hours, also no trouble) after that. when it decides to start it runs fine (no indication of an issue).

it didn't start again this morning, so i had to ride my bike to class and got there super late. i tried it again when i got back a couple minutes ago, still no dice. it's not raining but it looks like it might.

i really need some insight here, please somebody help me out.