Stocks rebound as energy offsets auto worry
* S&P briefly rose more than 1 percent within the last hour of the session in choppy trading.
* Shares of Chevron jumped 4.7 percent to $79.12, but General Motors was down about 2.3 percent at $4.59, while Ford shares were little changed after falling more than 4 percent earlier.
(Reporting by Deepa Seetharaman; Editing by James Dalgleish)