This is a second post on the same issue. Sorry I do not know how to get a link to the previous post but you can find it by searching the same title. I just want to give some updates after the suggestins from the rest of you guys, and also cry for help again.

98 Contour V6 Duratec 24v 2.5L Auto

1. I bought the car not running so I have no history on it.
2. The engine was turning and kinda trying to start
3. Replaced the cam position sensor with a known working one, reset the ECU, turned the key 3 times to build fuel pressure (I could hear the fuel pump building it up)
4. Turned the key and the car started. It runs but it is idling rough, misfires and backfires in the intake tubes. Has no power, hard to rev and more pops come when trying to step on the gas.
5. Replaced the crank position sensor with a known working one - Runs as described in # 4.
6. Replaced spark plugs, wires and coil. Cleaned the MAF, new air filter and PCV valve. No obvious vacuum leak, at least nothing visible on the plastic and rubber hoses. Fuel valve sprays strong. Runs as described in # 4.
7. Took it for an OBD II check although there was no CEL. 2 codes came up
P0171 - System Too Lean - Bank No. 1
P1152 - Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2.
8. Replaced the fuel filter - Runs as described in # 4.
9. Replaced the fuel pump - Runs as described in # 4.
10. The spark plugs on the front side of the car were black with carbon. The ones by the firewall were clean like washed from the gas. All of 6 of them smelled like fuel.
11. Rebuilt the UIM & LIM, as described in the MODS section in this site and installed new spark plugs - Runs as described in # 4.

After the forum posts

12. Got a donor working coil pack, wires and plugs. Veryfied the firing order - Runs as described in # 4.
13. Got donor precats O2 sensors - Runs as described in # 4.
14. Checked the three harnesses on the passenger head to make sure they are COMPLETELY clicked together. They are!
15. Replaces the IAC - Runs as described in # 4.
16. Everything on the fuel delivery system side checks OK
17. Wiring harness looks pretty good, as far as i can see
18. Could not check the computer from my donor car. VIN sensitive i guess
19. It is NOT the MAF

Sorry i am not really sure how to check for vaccuum leaks, and i have not done a compression test, but more and more i knock off possible reasons, more i think it is a timing chain issue (chain slipped few gears but not broken) or bad valves, because one of my friends said he doesn't feel any vaccuum suction. I am not really sure how he got that or whta exactly he was talking about. However, please i need a lot of help because i am in a position to drive this car off of a cliff ASAP.
Thanks