Question about 2000 Toyota Tacoma PreRunner

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I have a 2000 Toyota Tacoma V6 Pre-Runner, which I purchased new. I am experiencing sudden surges in the engine speed at some very unpredictable times. I was backing into my drive way and shifted th

I have left it with my automotive repair specialists several times, but they cannot find anything on the diagnostics nor are they able to replicate the situation. It seems to occur most often when backing up, but on occasion it does seem to happen when the AC kicks in. I know there is an automatic surge, but sometimes it is more than just a small boost. If I hit the brake, it seems to cause it to return to normal. Last night was the first time it really occurred when I could do some investigation. There never has been any diagnostic indication of a problem. Also, the vehicle has less than 150k miles and is well maintained.

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Surges can be from vacuum lines. Check them. Especially the rubber parts. If they are collapsed or soft/spongy, replace them. Next I would clean the mass air flow sensor and the inside of the throttle body.

Posted on Dec 06, 2014

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Posted on Jan 02, 2017

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www.chilton.com

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