2006 Ford Taurus Questions

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Check engine light was on for a long time! Had diagnostic machine put on it and decided to start with new spark plugs, since the car had a missfire!
I turned the check engine light off by disconnecting the negative battery cable! . It stayed off two days! Then one day I turned the key to start it, heard a piping sound and the light came back on. The car starts good and runs good now with the new plugs! It also has a new starter! But, just turning the engine over caused the check engine light to come back on! Why?
I have a 2006 Ford Taurus SEL and lately I notice that my car has been whining or squeaking sound whenever I m at a stop or slow down but when I accelerate I cannot hear it. When I turn off my car I notice a little leak where my power steering or belt is ? What do I need to replace?
as long as I'm giving it gas or have the cruise set it's good, but it will not idle.
is it too hard to do myself?
put in a new thermostat. when it idles the temp hand goes up to normal.
when i drive it falls back down to cold. The heater blows cold air out on defrost and warm air out on the floor. I do not know what is wrong with my heater.
2006 ford Taurus v6. haven't had any other problems prior, except battery went out. Could it possibly be spark plugs need replacing. I checked the fuel pump Cutoff button, reset it and changed my fuel filter so far
Here's what I have so far from chasing the rabbit down the hole...
New Autolite Platinum plugs gapped .042
<2000 miles on Duralast plug wires
New BWD ignition coil pack (twice)
New cats y-pipe with 3rd (Unmonitored) deleted
New Bank 2 Sen 1&2 O2 sensors
New Heated PCV
Vacuum runs 19-21.4 at idle. Drops to 0.5-1.0 on take off then to around 12 to maintain on flat ground.
Idle in park fluctuates between 650-750rpm
Replaced vac line & coupler on the backside of the air intake tube behind the MAF.
Ran the smoke/propane/water mist tests, no leaks
Barely gets up a small hill going 20 with about 50% throttle. All the while stuttering like it has a bad plug
Alt & Batt tested good
Belt and tensioner good

Shows codes P0353(intermittently) & P1000 (constant, no CEL)
My 2006 taurus passenger front window won't roll up. And my radio won't come on either
I didn't turn the key all the way off and the battery ran down. Now it will not jump off but the dash lights and radio will come on but will not crank
When starting, the engine cranks over many times before starting
Starts every time, but immediately stalls
I installed an after market radio and I blew a few fuses but now the gas gauge is not working and the message center and mileage is not working
My oil presure light is on in my dash and when u try to start the car it makes a single click why wont my car start changer alt. Batt. And checked fuses and fuse relays what could it be????
po 420 code - car runs fine , light came on yesterday
Codes: PO 300 PO 301 PO 306 PO 352 Vehicle has over 150k miles on it
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