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Okay a "marbles" sound under the hood while your trying to accelerate is REALLY BAD! what you´re hearing is detonation. More specifically its the sound of the piston rattleing its way back down from TDC.

I would check your timing. You might be too advanced. It´s probably in some way related to the lunging...but maybe not. I´ve never had my car lunge or jump. In other peoples car´s I´ve driven it was always clutch related.
 

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Maybe a little knowledge about how lightening the drivetrain can help and hurt you is needed.

Anytime you lighten the drive train (cheapest is an underdrive pulley, then flywheel, then custom balanced crank). You are improving the motors ability to rev faster, giving you more horsepower and great top end performance, however do keep in mind that if you do this you´re going to loose torque and your low end.

With a sport compact like ours torque is our killer...Its really helpful that our cars are only like 2600lbs but becareful on going too light with a flywheel. It might help on a dynowheel but not at the track or street.

Fidanza makes a pretty good lightened flywheel for I think 350 bucks. Its 8.5lbs (I think). Aluminum flywheels seem like a big craze, but aluminum is pretty weak. If you do get an aluminized flywheel make sure that its studded or riveted with steel to reenforce it. Ideally Chomoly would be awesome, but being a minority performance vehicle I dont think any company makes one that is for us.
 
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