Have a 98 van. was leaking and steaming on highway.

Pulled over had it towed to tires+ they say heads are gone and want
2200.00.   I do not have much steam or anything coming out of exhuast.
So, that goes to say I dont really trusst much that T+ says.

It has sat at home for 5months. and then I decided to do something
with it.  Not it starts hard and when I press accel it revs up and
down in one second cyles... fast slow fast slow....

I did though find the source of the bad steaming as I found a small TB
cooling hose with a pinhole leak in it spraying right on the manifold.

I replace both and claned TB and intakes.  replaced cooling fluid...
etc.

Car runs better but still revs.. (I think it may be old bad gas), and
still heats after 5-10 mins in park.

I am thinking Water pump or thermostat?  any other issues before I
pull this apart?

Thanks.