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1968 Chevy Impala high rough idle

Tiny
DANNYOSTERTAG
  • MEMBER
  • 1968 CHEVROLET IMPALA
  • V8
  • 2WD
  • AUTOMATIC
  • 10,000 MILES
Hi my name is danny and I have a 1968 impala. My motor came out of a 72 stepside its a 327 with electric choke, and 4 barrel carb. My car has been sitting for 5 years. I started it up about 2 weeks ago and found that it idles verry rough and fast and backfires every 30 seconds. What should I do im thinking I should buy a rebuilt carbuerator with manual choke and give a tune up but im not sure
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Wednesday, May 5th, 2010 AT 7:02 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi Danny:

Sounds like a neat car. Did you replace the old fuel that was in it? Also, is it backfireing through the exhaust or intake? Finally, is the choke closing all the way when cold and opening after it warms up? NOTE: If it is closing tight, that is one problem. You should have about a 1/4" opening when it's cold and it should open fully when warmed up. Did you check for any vacuum leaks? Finally, what type of ignition does it have, points / condenser or HEI?

Also, was the car ever started while it sat and move short distances?

Let me know so I can better help. Muscle cars are my favorite!

Joe
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Wednesday, May 5th, 2010 AT 10:45 PM

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