Quote:
Originally Posted by TopherS
I had a similar problem with my 95 Roadmaster sedan. The car would shudder on level ground or very slight incline whenever I would accelerate. I was told that my water pump was leaking and the antifreeze was getting on and affecting some electronic part of the ignition system. I realize the two cars are very different, but perhaps this may give you good leads on possible culprits...Good luck.
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Water pump leaking on an Optispark & causing misfire is quite common on the LT1 Roadmaster, but this does not apply in the case of a Park Avenue. When you changed the plugs, you lowered the resistance somewhat, but not enough. Change the wires with ACDelco, Belden or MSD. You could have a weak coil also, but that can be determined after the wire change.