It may "fit" under the hood, but it would not work. The engines are different, computers are different, wiring harnesses are different, and transmissions are different.
The 2002 Dodge Grand-Caravan has a V6 engine.
The 2002 Dodge Grand-Caravan has a 3.3 L base engine size.
The 2002 Dodge Grand-Caravan's engine produces 180 hp @ 5000 rpm.
The 2002 Dodge Grand-Caravan's engine produces 210 ft-lbs. @ 4000 rpm.
At a recycling yard.
It has an engine computer (PCM)
No
Yes you can but, you have to use the flywheel off of the 2002 engine on the 1998 engine other than that you just have to hook up the wiring harness off the 2002 onto the 98.
The engine and transmission are removed out the bottom as an assembly.
Yes
There are four oxygen sensors on a 2002 Intrepid. There is one before, and one after the catalytic converter on each side of the engine.
The brake fluid reservoir on a 2002 Dodge Caravan is located on the master cylinder. This will be in the engine bay, on the drivers side, near the top.