RPM not stable and constaintly vibrating

Asked by Mar 05, 2015 at 12:56 AM about the 1996 Toyota Corolla

Question type: Maintenance & Repair

At morning time, when i start my 1996 corolla car, its RPM goes down and off the engine but i press accelerator paddle to make it stable. So it not stable always vibrating. so need advice with solution

3 Answers


possible vacuum leak or idle air control valve

Get an OBDII scan. Many parts houses will do it free, and give you a code. For example P0300 is random misfire. Even if the CEL is not lit it may have thrown a DTC fault that is stored. But don't buy anything yet. Electrical parts can not be returned, even if never installed. Bring the codes(s) back here, in a new question so we will know and myself or somebody will assist you.

When it has the code P0300 what could b d fault??

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