Hello, This code means your #4 cylinder is misfiring. There were 2 different coil systems used for the 2 engine styles that year. The top of the Intake manifold will need to be removed to provide access.
The 4 Valve engine used coil-paks and you need to mark the position of each sparkplug in relation to the post on the coil-pak. Check the terminals for corrosion, it may be fixed with a simple cleaning, or you may need a new coil-pak for this pair of cylinders. With most of the work already done, you may want to replace #4 sparkplug and the rest while the intake manifold is off.
The 2 Valve engine had a coil on each plug. Usually there is a 10,000OHM resistance from the top of the coil to the bottom terminal. You can take the coil into Autozone, Oreillys, or Advance and they may be able to test it. Again, now would be a good time to replace all the plugs while the intake manifold is off.
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