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not all of the cylinders are firing?

I did a tune-up on my 1998 plymouth voyager. New plugs,new cap and rotor,new plug wires. What else could be wrong?
Tim, May 2008
other than that I'd say a valve spring is broken in the head...

mal, May 2008
also are all the spark plug wires in the proper firing order.???

mal, May 2008
did you adjust the gap in the plugs to the right settings.???

mal, May 2008