ok so im slowly getting my car back up to speed. well recently i have been hearing a hissing noise when i drive my car. it gets louder when i get on it and so forth.

when i get to a light its starts to shake at idle. i put it in neutral and it idles more normal but still hisses and shakes less.

im thinking that shaking at a stop and feeling like its going to stall is not a normal thing.

any thoughts.? Im thinking vaccum leak or a sensor somewhere. im doing my best to figure all that i can with this car.

thanks for all the help and advice.