I have a 99 toyota corrolla. The first time the engine light came on, I took it to pepboy for a diagnostic. They always me it was the selenoil. I told them to replace it. 2 days late the engine light came back on. I took it back to pepboy they said they "forget" to turn off the switch. A week late the engine light turn on again. The technician at pepboy don't know jack! anybody why my engine light keeps turning on and off? very frustrating.
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The mechanic should check on the Idle and adjust the Idle .the car is vibrating because of the Idle is low and the engine can't do to move very easy .there is low fuel coming from the fuel pump going to the engine.The transmission of the car don't have a problem because of you just change the oil . But the Idle has to be adjusted until the car will not vibrate.
Did you have engine trouble codes checked? Parts stores will do it for free. Ask them to explain what the codes mean, and what they recommend. If you have any questions, post them here with the code #'s. The engine light can come on if the gas cap is loose, but after securing, should go off. How is the cars performance? Running ok, just engine light coming on?