RPM not stable and constaintly vibrating
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
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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