It's something I see a lot of. Only thing you have to worry about is annoying you're competitor to the point where they drive your adspend through the roof and try various ways to catch you're traffic too.

We just had a competitor do something similar. Google wont mind much though

I had this problem exactly and it turns out it was an index file on the server for the old page.

It was the only temporary redirect on the site so it was driving me mad and I wanted rid of it! FTP onto the server and check the folder for the old page which will likely contain an index file. the 302 was in there for us.

This is an old question but posting this for people in future.