Jimm 11/16/2012Here some simple suggestions;
Check your fuel system, dirts creates poor combustion - means some of the mixture were not burned during combustion.
Dirt inside fuel tank - clean it w/ fuel cleaner
Clogged fuel lines - clean the lines
Clogged fuel filter - replace filter
Clogged fuel injectors - clean fuel injectors
Dirty air filter - replace air filter
Low tire pressure - check and fill to the recommended pressure
Have the on-board diagnostic (OBD) system checked (scanned) for free - at any local auto parts store. Retrieve any stored codes that maybe not displayed.
Post a reply with these above possibilities and any specific fault code(s) - for further assistance.
Visit these parts sources; www.RockAuto.com or www.autopartswarehouse.com for parts as required.