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Message: <blockquote data-quote="94kingcbra" data-source="post: 513486" data-attributes="member: 9140">I think your pcm may not be controlling your timing...Hook up a timing light like you would normally, then plug the spout back in after you verify base timing with it out...Once you plug the spout back in the computer should take over control of the timing based on the input from all the sensors...If you don't see a significant change then you got a problem somewhere in the ignition primary circuit...IF you think your coil is going bad you should test the power of the spark using a spark tester...The spark tester simulates the condition of the combustion chamber on the compression stroke by having an extra large gap...The big gap requires full voltage from the ignition coil to work....If there is no spark on the tester then that means you have a problem between the ignition coil and end of the spark plug wire...But like Paul said ignition coils rarely go out, unless it was dropped or you can visually see the spark coming out of cracks it's probably not your ignition coil...There are ways to test it though if you like, let me know...Good LuckJustin</blockquote>