Timing chain & spark plugs

What do you mean by timing change? What is the reading on a compression tester or cylinder leakage test? If you changed the timing chain, did you make sure you are not one cog off?

Big job see me at www.autorepairhelp.us and will send info to you.
1131 052 - Replacing both timing chains (N62/N62TU)
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Special tools required:
-11 2 001 See: Toolsand Equipment/ll 2 000 Puller
-112 002 See: Toolsand Equipment/ll 2 000 Puller
-112 003 See: Toolsand Equipment/ll 2 000 Puller
-112 007 See: Toolsand Equipment/ll 2 000 Puller
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Necessary preliminary tasks:
-Remove lower timing case cover See: Timing Cover/Service and Repair/Removing
and Installing Bottom Timing Case Cover (N62 / N62TU)
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Remove timing chain (1).
Remove timing chain (5).
Release screws (7).
Remove guide rails (3 and 6).
Remove tensioning rails (2 and 4).
Installation:
Maintain tension of timing chains when installing timing case cover.
Observe sparking protection on timing case cover.
Make sure timing chain (1) is correctly installed when placing it in guide rail (3).
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Attach special tools 11 2 001 See: Tools and Equipment/ll 2 000 Puller and 11 2 002 See:
Tools and Equipment/ll 2 000 Puller to crankshaft.
Insert special tool 112 007 See: Tools and Equipment/ll 2 000 Puller and remove
sprocket wheel with special tool 112 003 See: Tools and Equipment/ll 2 000 Puller.
Installation:
Check sprocket wheels for wear, replace if necessary.
Heat sprocket wheel to 60 CC.
Warning!
Burning hazard! Wear gloves.
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Assemble engine.

With the milage your vehicle has , I would assume the timing chain is stretched. To check timing chain, take off the distributor cap, turn engine by hand clockwise till the distributor rotor begins turning. When you stop turning it start to turn back the opposite direction while watching the rotor, there should be no delay between the time you start to turn engine,and the time the rotor begins to turn. If there is any delay, then the timing chain needs to be replaced.

A defective signal wire from the processor.

Personally i donot think you need to put the four point plugs in your car.That would just increase your fuel consumption a bit as it would be burning more fuel to give u the advance pickup.You really donot need that.Put single point Champion plugs,they are really good.Then Bosch, Denso or NGK come in line.get the distributor rotor clean so that strong current goes to the plugs and its all set.On average the SUVs the size of your car would give 7kms on a litre petrol in an average traffic city drive with Air conditioner switched on.You can convert that into milage per gallon.Milage generally increaes by 25-30% without the airconditioner.

Mitchell labor guide, time to remove and replace timing chain 5.3 hrs.

YOU NEED A LONG EXTENSION WITH SPARK SOCKET.YOU ALSO CAN BUY LONGER SPARK PLUG SOCKET AT ANY AUTO PARTS STORE OR SNAP ON HAS IT.

No special tools, however the hard part will be getting the plug wires off without pulling the inner contact apart. Rotate the boots on the plugs before trying to remove the wires.

There is a detailed explanation in the ford workshop manual for this, and some special tools are required to get the timing right. I would not recommend doing this without the special tools. Contact your local ford dealer, they might loan you the tools and the manual for a fee.
Hope this helps, Mark