1998 Plymouth Voyager Cracked head, blown head gasket or ot

Engine Mechanical problem
1998 Plymouth Voyager 6 cyl Two Wheel Drive Automatic 160K miles

Hi.

I love my van and I love the 3.0 Chrysler motor. Has never gave me a moments problem.

Here's what happened.

I had driven the van home and the motor was hot. My wife was cleaning our vehicles and sprayed the 3.0 motor with degreaser.

She started to hose it off and I told her not to because the motor was hot. I went inside and she did it anyway. (After starting it and letting it run)

Van ran fine then and when I left for work the next day it was fine as well. However, I stopped in at Hess to gas up and put $20.00 in gas in it.

After I left, within 5 minutes, it started running like crap and the "Service Engine Soon" light came on.

I thought I has purchased some bad gas so I went somewhere else and put another 20 in. From there it only got worse.

So, I drove it home and got my car.

Here are the symptoms:

No smoke at tail pipe.
No Water in the oil.
No oil in the water.
Seems to me like a lot of air bubbles in the radiator water.

Runs poorly, like maybe three of six plugs wires not even there.

What is likely to be the issue here and in what sequence should I attempt a diagnostic check?

I have a handicapped kid and my wife needs our car. I need to get this going fast.

Any help would be greatly appreciated.

Thank you,

John
I'm in Daytona