gas cap light keeps coming on on 1999 Cadillac Catera

I have replaced fuel cap, tank pressure sensor, checked all connections. Worked for a few days and the light comes back on Car loses power when this happens

by in Denver, CO on May 13, 2010
1 answer 1 comment
ANSWER by on May 13, 2010
This is a pretty large subject. Here is an article I wrote about for 1 of the more common Evaporative System Codes and there are several. What is the Check Engine code and please be specific.
COMMENT by on May 13, 2010
There is no check engine light that comes on. There is a fuel cap light that comes on. The transmission seems to lose the first two gears when this happens

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