Vehicle- 2000 GP GT 3.8, NA 175,xxx miles (got a good deal)

Bought the vehicle, paid cash, got the title, and was happier than a pig in the mud. Then the gremlins woke up.

Problem 1- Found a leak in the radiator. Small pinhole, but enough to make the low coolant come on. Sometimes it just flickers now and then.
I plan on just replacing the whole radiator, cap, and thermostat at one time. Just wasted money on getting it flushed. Go Figure.

Problem 2- The darn ABS and TRAC OFF lights keep coming on. I thought I heard something from the front drivers side wheel area. Like a brake pad rubbing on the rotor. Didn't think much of it. Then when braking, the ABS would kick on, like I was slamming on the brakes and it was trying to not skid. It happens a few times, and really worry-some, then the ABS and TRAC OFF lights come on, then it doesn't pulse and act up anymore, like it shut down the ABS system. I can here a few clunks and clicks from up front, but cannot determine where they are coming from. I guess I will have to jack up the car and wiggle the wheel in the 12 and 6 o'clock position to see if it has play. I need to find time to get it in and have the ABS codes read.
What do you all think? Pulsing brakes, like the ABS is kicking on hard core.

Problem 3- Check engine light came on. ( I know, I just bought the car and the darn instrument cluster is lighting up like a flippin Christmas tree!) Took it straight to Autozone to get the codes ran. MULTIPLE CODES!!!! The guy about crapped his pants and asked HOW it was still running. It actually runs fine. Not great, but fine. The tranny shifts very hard into gears, but I think it's one of the codes. Here they are:

P0118- (engine coolant temp) sensor (Could this be because the pinhole in the radiator and the fluid level drops, thus throwing the low coolant light?

P0171- Fuel Trim Bank One
possible causes:
Fuel pressure or MAF sensor
O2 Sensor Defect
Ignition misfire
Fuel injector problem

P0300- Cylinder misfire detected- random cylinders
Possible causes:
Vac leak
Injector fault
Ignition System Fault (plugs, wires, coils)
High/low Fuel Pressure

P0327- Knock Sensor Condition
Possible Causes:
Knock sensor defective
check connector and wiring to sensor
engine mechanical condition
Low Fuel Pressure

P0122- Throttle Position Sensor (TPS)
Possible Causes:
Sensor Open or shorted internally, replace
Check connector and wiring to sensor
Is this the reason why the tranny is shifting hard as soon as the check engine light comes on? Does the TPS tell the tranny when/how to shift?

P1404- EGR Valve Stuck Open condition
Possible causes:
failed EGR
Carbon blockage of pintle

P0404- EGR system Fault
Possible causes:
Failed EGR valve
open or short circuit condition
Failed EGR position sensor
Failed EGR pressure sensor where applicable

P0442- EVAP small leak/no flow condition
Possible Causes:
Defective or lose fuel cap
Evap Canister or hose cracked or not connected
purge or vent solinoid defective
vac leak at engine

P0336- Crankshaft position sensor condition
Possible Causes:
Crank Sensor defective
Check connector and wiring to Sensor
check trigger wheel for damage

P0332- Knock Sensor Condition
Possible Causes:
Knock Sensor defective
check connector and wiring to sensor
engine mechanical condition-knock or rattle in engine
low fuel pressure


(anyone yell BINGO yet?)
HELP!!!!!!!!!!!!!!!!!!

What I bought so far and have YET to replace:
Oil/Filter
Air Filter
PCV Valve
Trans Filter/Fluid
(said plugs and wires were done 3 months ago)
I still bought new Plugs and Wires

Cleaned MAF sensor
Cleaned MAF Screen
Coolant flush (pinhole in radiator, replacing radiator)

Going to turn rotors. Possible replace if needed.
Front pads new, will double check them
Rear pads look worn, will replace regardless.

Owner said CV half shaft was replaced. Not sure what side. Still hearing some clunking/clicking here and there on drovers side. NOT when turning though. Possible struts or other steering components? Maybe HUB? Could be why the ABS light came on?

As you can see, I have my hands full and need some advice.

Should I just buy a TPS, EGR, Knock Sensor, MAF sensor? Or is there a better way?

If I can think of other symptoms, I will post them.

Also heard a little whining today in the engine bay. Need to check and chance the PS fluid. Wheel is not hard to turn.