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  1. OEM Issues
    I have a 2002 Envoy w 4.2 liter 4x4. It has 230,000 miles and I just bought it. Have no clue if it was serviced when it should have been or not. But the other day it started making a squeal or kind of whistling when shifting from 1st to 2nd. And then it tends to lose power. If l ease into it...
  2. Air Induction
    I have a 2004 Blazer with Vortec 4.3 I6. ~73K miles. When I push down on the gas pedal in drive, a whistling noise ramps up like a tea kettle. About half way to the next gear, it dies off and starts again shortly in the next gear. It is very loud when the engine is cold, but quiets down...
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