P0302

Hi guys: I have 2000 Ford Expedition 5.4 4WD XLT. Since few months my baby has some problem to run specially when up a hill and she dont wants to go. I did research about that code and found that information on internet.
1. Faulty spark plug (http://www.obd-codes.com/p0302#) or wire
2. Faulty coil (pack)
3. Faulty oxygen sensor(s)
4. Faulty fuel injector
5. Burned exhaust valve
6. Faulty catalytic converter (http://www.obd-codes.com/p0302#)(s)
7. Running out of fuel
8. Poor compression
9. Defective computer (http://www.obd-codes.com/p0302#)

First I save some money and went to the mechanic and did change number 1, 2, 4 and option 3 he change the O2 sensors on driver side passenger sides were hard so he told me to put the WD40 for atleast a week and then come back to chage the rest of the two passenger side O2 sensors.

My baby still has the same problem. It runs very good when it cold but once it warms up it has hesitation which i think called misfire. Compression test when motor was cold was 130 on cylinder 2. One of my friend did the same test but the motor was hot and it was 180 on number 2 and 181 on number 1. It has the same code all the time P0302

PLEASE HELP