ok so as i was looking for a vac. leak i seen this wire that was not plugged in and i dont know where is goes i looked all over all i can think of is when i got the car the guy put a after market oil pressure gauge in and this is the plug for the stock oil pressure.

http://i153.photobucket.com/albums/s209/dtuned_photos/motor162.jpg

http://i153.photobucket.com/albums/s209/dtuned_photos/motor161.jpg

http://i153.photobucket.com/albums/s209/dtuned_photos/motor159.jpg

is your cars idle ok? try to check behind the alternator, if not, on the engine block under the intakes.

well jusdging by the oil on the inside of the plug it looks like it hasnt been pluged in, in some time