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Trumpeter Extraordinaire
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That, I believe, indicates a misfire on cylinder #4.

Possible causes (as listed in the 1994 PC/ED manual, as I don't have access to a 1998 manual):

Possible Causes:

-- Ignition System.
-- Fuel Injectors.
-- Fuel Pressure.
-- Evaporative System.
-- Canister Purge.
-- Base Engine.
-- Running out of fuel.

...a good number of things to check.

If the vehicle ran out of gas recently, reset the PCM. If this is not the case, start by checking the spark plugs and wires, if there are no other codes present. If other codes exist, tackle those first.
 
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