Question about 1993 Isuzu Trooper

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Just bought 1998 hyundai elantra with 96K miles on it. engine light came on and when i stop at red light, the rpm goes down and car starts vibrating. it gets better when i put it to park. anyone can help what cause the drop in rpm? thank you!!!

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Sounds like the ISC (Idle Speed Control) which is adjustable.  The secondary idle needs adjustment to prevent the car from wanting to stall at low speeds.
Greg

Posted on Jun 19, 2009

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A lot of things can cause a drop in rpm's.
Go have a code scanner hooked up to it, that will show why the engine light is on. Autozone or advanced auto do it for free, if there is one near you.

Posted on Jun 19, 2009

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