Forgive me asking as this isn't my forum yet, but sounds like a timing belt issue. (Honestly I think 2.4s have timing belts). That could cause a few of the probelms. I'd probably check the sparkplugs first though (unless they were replaced recently) might give you an idea if there's a problem cylinder. (Plus checking sparkplugs doesn't usally require you running it more and f'n it up more)
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`03 Alero GL 2.2L Ecotec
Alpine Headunit, 18" Ave 7 rims, drilled slotted rotors, painted calipers, cleared corner.
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