Allright, let me give this a shot:
"1.) Code 44 is set when the O2 sensor signal voltage remains below .3 volts for 50 seconds or more and the system is operating in "closed loop" "
First off, its pulling a code relating to your O2 sensor. How old is your sensor? What brand? Is it Bosch? If its Bosch, then I'd say replace it with Denso or AC Delco and that might fix your problem.
The code 44 for lean exhaust is most likely caused by one or more of the following:
1.) O2 sensor wire - Sensor pigtail may be mispositioned and contacting the exhaust manifold. (i checked and its not touching nothing.......)"
Again, issues with the O2...
"2.) Check for an intermittent ground wire between connector and sensor."
This isn't really likely... the O2 has one wire that would have to be grounding itself out on on somewhere, like a pinch or something.
"3.) Poor ECM to engine block ground.( dont know where this is) help.?)"
The ECM ground is (I think) on the bolt on the engine block under the ICM. Its the same bolt that the negative battery terminal grounds on.
"4.) MAF Sensor - A MAF sensor that causes the ECM to sense a lower than normal airflow will cause the system to go lean. Disconnect the MAF sensor. If the lean condition is gone then replace the MAF sensor.( mine is new but i will check it out tomorrow and post back...))"
If yours is new, then it should be OK, unless you got a crappy sensor. Who was the vendor? Is it an AC Delco part or some aftermarket part? Does the engine run any different when you remove the wire harness from the sensor? If it doesn't change, then the sensor is probably faulty.
"5.) Vacuum leaks can cause a lean condition and/or possibly a high idle. Check for cracked hoses a bad gasket or a faulty EGR or PCV Valve.(i have a very high idle and i do not no where i shold check . what hoses do i check.? what gasket.? and where is the egr and pvc valve again.? and how do i check them.?))"
High Idle? Thats not good... your best friend is going to be a can of carb cleaner. Find all your vacuum lines (rubber sections of line, sometimes connecting plastic sections, the rubber breaks down over time and cracks allowing leaks) and spray each one down with the carb cleaner. If the idle changes, then you found your leak.
The EGR is under the round black cap on the top of the motor near the firewall on the brake booster side of the motor. If you are to pop the cap off, the valve consists of three solenoids. Spray the base of the valve around the gasket seating area.
The PCV valve is your positive crankcase ventilation valve and is located near the UIM, near the power steering pump, and under a bunch of harnesses. Its a bit hard to find but if you do a search I'm sure a better description will pop up.
Also, consider cleaning your intake, as your IAC (idle air control) might be clogged, causing the high idel: http://www.lesabret.com/phpBB/viewtopic.php?t=4054
"6.) fuel pressure - system will go lean, if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm.(( how do i do this.? Shocked )"
This is easy. First, rent (autozone) or buy a fuel pressure gauge. It screws directly into the shrader valve on the fuel rail. If pressure is too low, then either your pump is weak, your filter is full of crap, or your pressure regulator is faulty. Search the forums for more information.
"7.) Clogged injector or lean injector - perform an injector balance test..( what.?) "
No clue what the balance test is, but it probably involves removing the injectors and testing how well they spray... I wouldn't do this If I were you but I would run a bottle of Chevron Techron fuel cleaner through your system. This should be done every 3k miles or so.... the stuff is a bit expensive ($6 for a little bottle) but it works well.
Heres the order in which I'd check this stuff:
1. O2. If its Bosch, replace it regardless of miles/condition.
2. Dump in a bottle of Chevron Techron.
3. Clean your intake/IAC.
4. Replace worn out rubber vacuum lines (super cheap, a foot of line is a couple bucks at most).
5. Spray down your EGR, PCV, and vacuum fittings to test for leaks.