Cadillac Seville / Cadillac Eldorado Forum Discussion, 1999 ETC bucking and surging at steady cruise speed in Past Cadillac Vehicle Discussion; At 65 mph and slightly noticable at a steady 45 mph my '99 ETC exhibits a surging in the engine. ...
At 65 mph and slightly noticable at a steady 45 mph my '99 ETC exhibits a surging in the engine. Feels like the gas pedal is being slowly pumped while cruising along.
I put my foot into it hard...... it's fine.
I have new plugs, new fuel filter, and new IAC.
Has almost 125,000 miles
Other than some pesky oil leaks it runs like a brand new Cadillac.
I forgot to mention that the local Cadillac dealer replaced the fuel pressure regulator type thing about a month ago when I dropped it off to them. It displayed a sevice engine light and the dealer pulled some codes.
The work they did knocked the service light out but it didn't get rid of the surge.