i have a 03 chevy avalanche with a 5.3 electronic throttle?

victor j

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lately ive been noticing in the mornings wen u turn it in it shakes a lot for like 2 mins straight then it runs fine but now the rpms go up and down wen its idling and wen u turn it on it does it too like it wants to stall but tries to bring rpms a little up but at high speeds it runs normal and once u gain speed its all normal only at idle and wen stopped at a light it shakes like it wants to stall
 
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