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You will need an OBD I scan tool, they are fairly inexpensive for this car, as you can read the trouble codes by the flash of the "Service Engine Soon" light. Most likey you have a code for the cam sensor, as every TPI 3800 gives this code eventually

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2007-02-19 21:23:23
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Q: How to check malfunction codes on a 1991 park ave?
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