1996 Trail Blazer

My B;azers "Service Engine Soon" light just went on - glove box book stated that it may be an emission, gas cap loose, bad gas, etc. Need help - I hear that it cost a bundle to have my car checked.

First off, you're new, so welcome. Secondly we can't tell you what's wrong just because your light came on. Finally, you might want to go to the forum for your Trail Blazer, they'll know more than most of us.