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1977 corvette running rough


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77vette
New User

Aug 23, 2010, 12:47 PM

Post #1 of 4 (1968 views)
1977 corvette running rough Sign In

I have a 1977 corvette with a 5.7 350 L42. I am not the original owner but have owned the car for 19 years. The car has sat in a garage for long periods of time without use on a few occassions during my ownership. I have been running the car regularly for over a year. The car runs rough (sputters) when cold and when warmed up. It idles fairly smoothly but is a mess at 1500rpm. Seems to smooth out at 2000rpm but not completely. I have replaced the distributor cap, rotor, plugs, wires and all filters. None of my attempts have made a difference in a meaning way. There is a faint valve tap in the #1 cylinder. What would you suggest my next steps should be in trying to identify the problem?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 23, 2010, 1:40 PM

Post #2 of 4 (1959 views)
Re: 1977 corvette running rough Sign In

How many miles in this engine?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



77vette
New User

Aug 23, 2010, 2:20 PM

Post #3 of 4 (1948 views)
Re: 1977 corvette running rough Sign In

Car has 67,000 miles.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 23, 2010, 2:36 PM

Post #4 of 4 (1944 views)
Re: 1977 corvette running rough Sign In

I think I'd start with a compression test on this one. It could have a sticking valve or broken spring issue.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







 
 
 






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