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2003 Mustang 3.6L 130,000 miles. Squeals obnoxiously after I crank it. I'm told it may be the water pump?? But this isn't what really concerns me, what concerns me is that whenever I drive it, it seems to hesitate, and jump... At low RPMs. It feels like it isn't getting gas... I don't know what may be causing this... Yesterday when it started jumping, I filled it up, and the problem seemed to vanish until later last night... I'm a new driver, so something like this is pretty scary. Any help would be appreciated. :)
 

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squeal = belt... check tensioner as well

idle, part throttle problem = I would believe you have an idle air problem. check air filter first, then change the fuel filter and go from there... Then find a good trustworthy mechanic to help you
 
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