1977 Other Chevrolet Models Engine will not operate at highw

1977 CHEVROLET
60,000 MILES • 6 CYL • 2WD • MANUAL
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MARGIEE2001
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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.
Aug 10, 2009 at 9:29 AM
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HMAC300
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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.
Sep 9, 2009 at 1:47 PM