My van started running rough just recently since Ihad a leak in my radiator hose.

SOURCE: 06 Dodge 1500 V8 4.7L: Overheating, Engine Light

Hi
Check for plugged exhaust system. If plugged will cause overheating and misfiring of all cylinders.

SOURCE: I have a 2001 Dodge Ram 1500 5.2L,

The plenum problem should not affect compression tests. It allows oil to get sucked into the intake and will cause carbon buildup, plug fouling, and pinging. If you have zero compression on a cylinder, it is usually a valve problem. Even a burned piston will make some compression, unless it has a big hole in the middle.
Sorry, but if your compression results are to be trusted (and it seems they are), then you have to tear a head off to find the problem, or at least get a borescope in it.

SOURCE: Dodge 2002 Grand Caravan V6 3.3 engine overheating/no cabin heat.

Replace the bad radiator hose first.  Second- get you special formulated anti-freeze dye from the auto store and pour it into the radiator.  Third- make sure you got all the air pockets out of your system, cause the coolant system won't work with air pockets in it.  Fourth- Check for leaks by looking for the colored dye.  If it's not the radiator hose, then could possibly be a pin hole in your radiator.  Would suggest replacing all the radiator hoses at the same time while you got the coolant system disconnected, cause you don't want to have to come back and replace another hose in a few months.

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SOURCE: rough loud engine sound when van idles

sounds like your lifters

SOURCE: 1999 plymouth voyager service engine soon- 163k

You need to get the engine serviced, plain as sight. it could also be a small problem too. Hope this helps!?

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