Tune up?

[Buggyman]

I am thinking about doing allot of work on my Ranger this summer. Its a 1998 3.0, 4x4 manual with 207,000 miles. I have never replaced the oxygen sensors and its been throwing a "insufficient EGR flow" code for the past three years. Gas mileage has dropped about 2 GPM in the past 7 months, and its idling fairly rough and it hesitates when I lightly step on the gas when its cold. Its about time for new plugs and the wires are only about a year old but are cheap, air filter is good. I am fairly sure I am in for a head gasket job, its using a little oil and there is obvious oil in the coolant and is producing some bubbles in the radiator. Any suggestions on what to replace? If I do the head gaskets this summer, anything else I should look at replacing while I have the engine apart? Should I look at replacing the radiator because of the oil and nasty crud that comes back after flushing it? This truck is my DD, am I going to damage anything if I keep driving it with this head gasket problem?
Thanks for any pointers!


p.s

It has also lost compression, the clutch "pops" much easier then before and if I park on a hill without the emergency break on, it will slowly inch its way down the hill.

 

[MAKG]

Coolant in the oil eats bearings. Coolant in the exhaust hoses oxygen sensors. You probably have one (maybe both) of these problems.

Even cheap spark plugs should last 15,000 miles or more.

 

[Original_Ranger84]

Coolant in the oil eats bearings. Coolant in the exhaust hoses oxygen sensors. You probably have one (maybe both) of these problems.

Even cheap spark plugs should last 15,000 miles or more.

I think he replaced the wires not the spark plugs. And yeah coolent is bad in the oil.

I would adjust the timing and possibly replace the timing chain/ belt if it doesn't have gears.

And MAGK I got my transmission put back together and it works great.