my idle keeps dropping way low

20,000 MILES
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2000 TAHOE ONE
  • MEMBER
  • 25 POSTS
car will be running great then out of no where idle drops so low i have to hold foot on gas. then sometimes will go back to normal any suggestions put new hei dizzy in last week just checked timing today and its 8deg btdc jcould somebody tell me how to time small block chevy 350 and what timing should be at
Apr 24, 2012 at 4:45 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
4-8 tdc is good depending on whether it gets spark knock or not. check the fuel pressure and carb for proper adjustment. check for a vacuum leak as well, spray intake and carb base with choke cleaner if it increases it's got a leak.
Apr 24, 2012 at 6:17 AM
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