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Jumping Tach Flash


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My 92 STS with a 94 Deville 4.9 w/42000 miles on starts to miss after driving it for about 30mins at hwy speeds. When it does this the tach jumps up about 5 to 800rmps during the miss. Car has 4000 miles on new AC Delco wires, Rapid fire plugs and auto zone distributor and coil, and ac delco fuel pump. Any ideas? Maybe the coil?


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Are you getting any diagnostic codes?

Only happens hot -- maybe the battery? or a poor ground connection that is intermittant when hot?


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