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Discussion Starter #1
Driving into work today, noticed when shifting from 3rd to 4th, or 5th to 6th, the RPM's would increase by 200 to 400, when pressing the clutch in, with my foot off the gas pedal. Never experienced this before. Tried searching, didn't find anything.
Thoughts?
 

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Try this.

Take your foot off the gas pedal for 2 seconds. The car should be engine braking at this point. Then clutch in. Does the RPM jump?
 

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What car?

I've had something like what you're describing happen on my Exige when the Cup airbox retaining clip vibrated loose and caused a vacuum leak.
 

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2007 Lotus Exige S
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That’s the year of the throttle cable correct? Might want to check the throttle return springs.
 
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