Ecotec Engine?

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rented an 07 ION last year out of Spokane. Ran it through Eastern Washington and Idaho on business. Seemed it had good inital tip-in torque from the start, and good foot to the floor acceleration at any speed, but in between there was absolutely nothing in the form of torque or acceleration for that matter. For example, going up a long uphill stretch I kept the pedal down to just before it would downshift to mainatain any type of forward progress.
Think this was due to altitude, or are they all this way?
Steve
 
For 2009, the 2.2 was changed to now have CVVT and I believe the 2.0 in the SS has direct injection.
 
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