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Hestitation at high speeds/high revs

1988 Views 10 Replies 6 Participants Last post by  bfivelover
My Insight has 63,000 miles. At speeds above 70, the vehicle hiccups, revs drop slightly and then it passes. Has anyone else experienced this problem and what was the solution. I am also concerned about low mpg. On a recent 650 mile mixed use drive I am getting below 50 mpg.
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High RPM issues in any car are often due to spark plugs. Have yours been changed? It's an expensive thing to do "just because" (the iridium plugs are super expensive compared to normal plugs), but if they have not been removed since the car was manufactured, now is the time to change them before they weld to the heads.

EGR valve issues are also common, but I doubt that's your problem since EGR lift at high speeds is only slight compared to low speeds.
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