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Drill BitsWorld
7 followers -
Your industrial supply solution.....
Your industrial supply solution.....

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Hello Scotty,
  Fantastic you tube advice, Question - I own a 2004 trailblazer 4.2 i6 LT. Idles fine when a/c is off. I cleaned the throttle body (off engine ) - Has new plugs after 118,000 - air filter good - no engine light - 
When engine is at idle with a/c on after about 10 minutes engine starts running rough - rpms @ around  500. Also, with engine at idle, i pulled vacuum hose off fuel pressure regulator and there was no change in rpm or performance or any gas leaking from reg or hose. Is this normal - no vacuum from either end of hose. I also changed the fuel filter.
  Keep up the great job - your advice is well appreciated by all viewers!!

Best Regards,
Joe 

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