Engine runs very rough

if it does not stumble/shudder after it warms up you got a dirty intake air plenum (thin brass blade looking thing after air filter) use some air intake cleaner with engine warmed up and running filter removed temp. spray entire surface till shiney again
if it does stumble after warming up you got a corroded ecm conector due to water infiltration there is a tech bullitin on this you can read on chrysler web site

change the fuel filter and check the fuel pressure

3.3 AND3.8 ENGINES TAKE OFF SERPENTINE BELT 15MM ON BELT TENSIONER . REMOVE 2 HOSES OFF PUMP. 5 ?BOLTS AROUND WATER PUMP. IT WILL COME OFF WITH ANTIFREEZE LEAKING OUT. HAVE DRAIN PAN UNDER . ALSO IT IS GOOD TIME TO CHANGE THE LOWER HOSES. REINSTALL WITH NEW GASKET, FILL SYSTEM, PUT HEAT ON HOT AND RUN UNTIL THERMOSTATE OPENS, AND CHECK FOR LEAKS, TORQUE IF NESSESARY ( ENGINE OFF)!!REFILL AT SIDE TANK

if oil level is ok, your oil PRESSURE is dangerously low.
Either the wrong oil was used, or your oil pump is going bad.

Ill bet on wrong oil since you just had it changed,

Hello,
Was the van starting before you changed the spark plugs and coils?

Is the engine turning but not starting?

Please reply in comments so I can help you.
Thanks, Donnie

sounds like the fuelpump might of gone bad the frist thing i would do is to have the fuel preasure checked.start there

Sounds like you may have a fuel problem. First check the air filter, if the engine can't breathe it won't run, the filter is a little hard to get to on this van so it often gets overlooked. Does it idle rough, you may have a vaccum leak. How does it run once you get going? Is it low on power? There was an issue with the flywheels cracking and spinning on the crankshaft hub,(3.3 and 3.8 engines only), this would ****** the timing as the crank sensor is mounted in the bellhousing.

use a lift, let van cool or change front three while van is cooling and from the under side of the engine change the other last three. They can be reached easily. No need to remove plenium.

When you say "tapping noise" it names off several problems, please clarify :)

- Can the car "turn over" (aka try to start)
- What do you mean it "doesnt run" it wont start - or - does it not drive forward/backward (but will start)
- When does this tapping noise happen?
- How hard do you drive the voyager?
- Can you do your own mechanic work (for small - medium sized projects)?