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1977 Other Chevrolet Models Engine will not operate at highw

Tiny
MARGIEE2001
  • MEMBER
  • 1977 CHEVROLET
  • 6 CYL
  • 2WD
  • MANUAL
  • 60,000 MILES
I have a 1977 Chevy PU 250, 6 cylender that will not come up to highway RPM. Now if I choke the engine it will come up to highway speeds and as soon as I let the choke off the engine will die. It idles, but it seems a little rough. Enough gas seems to be getting to the carburator, because it will run as long as I hold the manual choke partially closed.
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Monday, August 10th, 2009 AT 9:29 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It really sounds like you have a bad vacuum leak. If you have a guage available, hook it up to the engine and take a reading. You could also have a plugged cnoverter or collapsed exaust prior to the converter. A vacuum guage will show this as well with a low reading.
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Wednesday, September 9th, 2009 AT 1:47 PM

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