Rpm drops to 400 car vibrates a bit then goes to normal 700 to 800k
Salam my dear brothers,
I have corolla xli that I purchased almost in mid 2012. I don't drive much the car has only made 9300 km so far.
recently I started noticing a strange behaviour that I never observed before.
Previosuly when I would start the car and leave it idle it would normally be at 700 rpm. So that's kind of a normal rpm that the car settled at.
Now here is the situation
Car is neutral and ac off or if car is in gear and clutch pressed )
Given the above state of car I can notice that when I accelerate and then release it, the rpm goes high as expected and on release it drops way too low almost 300 to 400 the car vibrates a bit and then after a second or two it restores back to 700 rpm.