running like a dog.....

[sd1800]

Driving to work this morning noticed my car was considerably less powerfull down low and when actually giving it abit of a squirt it took forever to get to about 3300rpm and then just refused to go any further. It doesn't sound like its running properly either sounds alot deeper but not in a good way. I'm think maybe one of the sensors is shot causing it to run very rich or lean, but as you can see ive obviously got no idea really. Last night it was running sweet. Problem only appeared this morning. Any Ideas?