Burning smell, no smoke, sometimes sluggish start. on 2000 Ford Taurus

I recently had a timing gasket cover replaced, along with coolant and oil changes. Two months later, my car is sometimes sluggish to start, has an occasional burning smell while driving (but no smoke and engine does not smell hot either), and car seems fine otherwise. Any suggestions?

by in Paducah, KY on January 06, 2013
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