Park Avenue :: 1996 - Bucking And Hesitating When Accelerator Pushed Slowly

Here are the facts about my problem:

- 1996 Park Avenue 3.8 V-6
- 104,000 miles

Problem: When it warms up it begins to hesitate (at all speeds) when the accellerator is pushed s-l-o-w-l-y. It bucks and acts like it is kicking in and out. A typical example is rolling down a flat stretch of road at 65 mph with the cruise on. Here comes a small hill. As the vehicle begins going up the hill the cruise automatically tries to accellerate the engine to compensate for the hill. It begins to buck hard. I put my foot on the accellerator and can accellerate through the bucking and it smooths out. A few more facts.

- Problem ONLY happens when it warms up. Typicall this may be as much as 10 miles down the road.
- When it gets fully warm it will hesitate taking off from a stop light. Again, just small short hesitations. Even putting your foot into the accellerator it will not totally smooth it out.
- I have replaced all of the ignition coils, and the ignition module below the coils.
- One other very strange deal. When it was screwing up on me really bad and I was replacing the coils and the modules, I revved it up out of frustration. When I got to 4,000 rmp it began to cycle in and out. Almost like a 'whaaa whaaa whaaa whaaa whaaa and won't go beyond 4,000 rpm.
- The diagnostic guy at Autozone told me it may be the a MAP sensor, the throttle body sensor and my uncle suggested the crank sensor.