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2001 DTS, 2005 Mustang GT, 2010 MINI S
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The rear fuel pump noise can tell alot. Any strange new loud sounds or a change in the pitch can indicate a pump on its last legs.

Injectors very rarely go bad. 2-300K miles most should be ok.

'tach jumping around'...anytime you see a tach needle jumping around you should suspect something in the ignition system. Could be something as simple as a new cap and rotor.

Logan
 
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