As I was driving my 2001 Mazda Tribute today I was pulling up to a red light and I depressed the clutch pedal as I came to a stop. Once the clutch pedal was depressed the revs suddenly shot up to 3000rpm without any accelerator engaged. Since then it has happened whenever I do the same and the revs will not drop unless I engage the clutch in gear or I let the clutch pedal up upon which it will VERY slowly decrease in revs to the normal idle engine speed. As I am driving the car now feels like I have cruise control (it doesn't!) as the car will not naturally decelerate even when there is no accelerator engaged.I thank you for any help you can give me in advance as if it is a simple fix it could save me a trip to the mechanic!

Cheers,