: Shaky Tachometer at High RPM

04-18-06, 01:54 AM
1997 Eldorado, when run through second gear, the tach shakes from around 5400 to 6000 RPM, until it shifts into third. The engine's running prefectly smoothly, and not losing power. Sometimes it's a slight shake, sometimes it dips by 300 RPM or so, sometimes it shows it as shooting up to 6200 or so and then back to 5900, only to climb smoothly to 6000 and shift at 87 MPH as it always does.

It just started happening, no other anomalous behaviors.

Any ideas?

04-18-06, 11:24 AM
My brother's acted that way. It was the plug wires on his.

04-18-06, 11:29 AM