Diagnosing a high speed driveabilty problem can be tougher, because you usually cannot replicate it in your driveway. The first thing i like to know is what system is causing the issue spark, fuel or mechanical. Once this is determined one can then start troubleshooting that particular area. I use this style spark tester that you can get from Amazon, which enables plug wires to be snapped onto each end and the neon bulb is of a good quality. (the snap-on / blue point testers are the same repackaged) I take the existing coil wire out of the distributor cap and run it up and out of the hood in front of the windshield. Hook the end of the coil wire to one side of the spark tester, and then get yourself a long modern car spark plug wire that will reach from the tester back to the cap. ( if needed cut the boot off so it goes into the cap) tape up the ends of the spark tester with electrical tape to prevent any arcing to the cars body. Now you can drive the vehicle at high speed and watch the rhythmic flash of the tester. A break up or stutter of the spark would indicate an issue
Four can be hooked up at once if you want to see the spark going to each plug.
Four can be hooked up at once if you want to see the spark going to each plug.
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