91 8 plug(i dont understand the concept?) very low idle and have a brake problem

dreamer1uk said:

Hi,

The 8 plug design was to burn more exhaust gasses. Thats why you have those plugs on the exhaust side.

As for your problems, the 'hissing' noise you speak of, that could be your power brake booster. First item i would check would be the check valve located in the engine bay, on the brake booster. Is the check valve is ok, you may have a damaged diaphram.

I would also check for vacuum leaks too while the car is running. One way of doing that is by using a throttle body cleaner. The RPM's will rise if theres a vacuum leak.

When was the last time you did a tune up? and is the check engine light on?

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