Basically, a misfire is when a cylinder should fire at a certain time, but doesn't.

As for the whistling noise, I agree that it sounds like a vacuum leak. And since it only happens when the brake pedal is down, I'm still going to say it'* the brake booster.

PontiacDad - The master cylinder doesn't have a vacuum line going to it, the vacuum line goes to the brake booster, which the master cylinder is mounted to.

You sure there isn't a vacuum line for the MC? I am pretty sure there is one for the booster and MC. But remember, I am wrong more then I am right .


-justin

Somebody please correct me if I'm wrong, and if I still had my Bonne I'd go check, but there is no vacuum line going to the master.

I can't check tonight anymore, but I will in the morning.


-justin

The vacuum line goes to the booster only. Might try a little vaseline on the inside of the connection at the manifold vacuum source and the booster. I hear they're expensive to replace.

I see boosters go on eBay [87-91 gen] for $15-$20


-justin

Those are probably used or china. Not something I'd put in my brakes. And that doesn't count installation, Which is a b****. My papers say to quote an hour and a half to R&R one.

crazy *** night

So i am driving back from my trip about 80 miles from home.

Temp guage starts getting hot..hotter... then drops so i think mmkay

then hot again and just drops back to normal

So about 30 miles later it gets as hot as past the Red mark so i stop on the shoulder, get it towed, very annoying gettin towed 50 miles .

Doesnt even start now, the oil pressure guage is like at zero lol.

soooo

soooo....i'm gonna say that the whisling noise is the least of your worries at the moment.