`99 S10 Blazer noise

[leegreen]

sounds like a vacuum leak, hose or fitting is loose, cracked badly

[HO455]

Originally Posted by leegreen

sounds like a vacuum leak, hose or fitting is loose, cracked badly

I'd say the same. My 91 had a hose develop a hole on the underside that made a similar noise. The hose looked good from above but until I ran my fingers down the hose with the engine running I didn't know what the issue was. The hose simply had a 1/4 inch spot that rotted away.