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screaming problem, help!



My 84 has developed an intense screaming noise. It started yesterday, after the car had been sitting all day. I popped the hood with the car on and it sounds like it's coming from right around the throttle body. When driving (I had to drive it) it ranges from sounding like a tea kettle boiling to a muffled belt squeal, depending on the condition the car is in (ie. idle, slowing down, slowly speeding up, maintaining speed, etc). When I first popped the hood, it was pretty loud but not terrible. I checked the intake boots (no visable cracks) and felt around the throttle body but didn't feel any suction. It sounded like what you'd get if there was a strong force sucking air through a very small opening. When the car's idle dropped down a little, the sound got so intense I think I have some minor hearing damage. Any idea what is going on? Belts don't look like they're rubbing anywhere, couldn't find any tears in the boot, tb seems ok. The only time the sound isn't present is on strong
 acceleration (like having the pedal halfway down when you're pulling away from a stop sign or something). It didn't seem to affect the way the car drove, no warning lights are on (the oil one does work) and all temps seemed to be okay.
 
Dan


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