I knew I had a minor vacuum leak, but it got worse all of sudden while at a stoplight.
In trying to get through to the next block, the engine started to knock. (My guess is preignition thanks to the air/fuel ratio being off)
Now when I turn it on in neutral, the idle is intermittent and sometimes turns off but there is no sign of knocking.
First gear, however, is a no go.
The car did have a vacum leak (which the mechanic fixed), but it came back again.
Was wondering why did this leak come back again?
Is there another reason for it occurring?
Why is it sometimes better when the engine is started cold? (Tighter rubber?)
Furthermore, is there any other inspection I should do because of the knock?
There are no check engine lights.