bad solenoid,& starter
check your fuel pressure.
I have a 2005 chevy malibu and had the same issue... It's the fuel sensor.. Need to replace fuel system
Its your fuel pump very common on those cars
If the check engine light is illuminated, start with scanning for codes.
i would like to know what would cause the miss firing in Chevy Malibu
What would make your speed odometer stop working after putting an alternator on? 2005 Chevy Malibu
Someone else answered this question on here someplace but I'll say what they said by way of paraphrase. It would appear the 2004 body style was so popular, they decided to continue making it under the Classic label. The regular 2005 Malibu has a different body style.
Plugged catalytic converter?
Underneath you would have to get under the car
The subframe would be the same. The only thing with different engines would be engine mounts. But that has nothing to do with the subframe.
frozen pulley
The ECU would have to be reprogrammed.