1991 Buick Park Avenue

Engine Performance problem
1991 Buick Park Avenue 6 cyl Two Wheel Drive Automatic 191. Oo miles

Car runs and drives well then acts like it ran out of gas. Trys hard and almost will start. After sitting hour or 2 or overnite will start right up. Seems there may be strange smell like plastic or rubber burning under hood, could my coil pack or ignition module be going bad or could it be an intermittent failing crank sensor?Can these parts be tested on or maybe off the car?Any help is greatly appreciated.
April 13, 2010.

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