Probably just the battery. The OE batteries don't hold up (do a search and you'll see all kinds of dead battery threads) too well. Even with a jump, the alternator will struggle to charge the battery and may result in a low voltage condition that'll cause all KIND of gremlins. Put a new battery in and see how she responds.
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Rick 07 GT Prem: Alloy, MT, 3.55's, Steeda CAI w/Brenspeed tunes, FRPP Stingers, 275/40/18 Goodyear Eagle F1 A/S on SVT Cobras (OE GT500's), 14" shorty, Wheelskin side scoops & qtr window louvers, A-H rear window louvers, SHR honeycomb blackout panel, Sequentials, Hella Optilux Extreme XY fogs, Silverstars 06 V6: Legend Lime, Pony Package, 14" shorty, Sequentials, Hella Optilux Extreme XY fogs, Silverstars
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