Before you take it to another mechanic. I would test your MAF. I had one go bad a long time ago and what you are experiencing was one of the symptoms.
When starting off from a dead stop like from a stop light, The car wanted to fall right on it's face like the gas had cut off. I would have to rev it and feather the gas just to get moving. It was very unnerving as I was always afraid I would get into a situation where I needed to gun it and the car would simply not move or die on me.
It ended up being a bad MAF even though I never got a CEL as an indication it was bad. Once I replaced it, my troubles went away.
To test it simply unplug it and drive the car, this will cause the ECU to go into a default map and take the MAF out of the equation if it is in fact the issue.
May or may not be your issue but at least it's a cheap check that you can do yourself and save the mechanic's bill.
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- ian
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