captain cook

Last summer while on a short trip , at highway speeds ,my 92 Corvette decided to start running poorly. I was getting 30 mpg before the change and now it gets 18 or so.
Where do I start to find the problem. I have good "old school" abilities , but am a little lost with this newer technology.
Any guidance would be greatly appreciated.
Thanks in advance..

Cliff Harris

Pull the error codes:

http://forums.corvetteforum.com/1574918379-post18.html
http://corvettephotographs.com/c4vettes/codes.htm

What they mean:

http://forums.corvetteforum.com/1576116036-post35.html

That will get you pointed in the right direction. Don't make the mistake of guessing and replacing parts just to see what happens. That can be an expensive waste of time and money.