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I changed the plugs and wires on my 91 Bonneville and it ran even worse than before so I put my old ones back in and it runs bad still old lugs need wires still runs like **** I got everything right
 

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You could go to a local auto parts store and buy a SPARK TESTER. With this you can test each wire with engine running to see if there's good spark on all cylinders. The best way is to use a good scanner to see which cylinders are NOT firing. Could be plugs....wires..... bad/weak ignition coil..... etc.
 

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Another thing that might be in the mix of that poor operation could be a bad coil or a bad ignition control module. And check for any possible vacuum leaks. Pull the cover plate where the PCV valve is to be sure the O RING is still good also. Mr goodwrench
 
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