I think something is wrong with my car's engine. Last year, my muffler/exhaust went and I had to replace it. Now this year it seems to be going again, as the engine is loud and making popping sounds whenever I accelerate. Last Saturday, the check engine light was on, but it went off after a few hours and I don't think that had to do with this (but rather with the gas cap which I also need to replace). Any ideas? I don't want to have to replace my exhaust again, as it cost almost $1,000 to get it replaced last year. I have a '97 Camry V6, with 129,000 miles on it. It's only been about 10,000 miles since I installed the current exhaust system on it.