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Sounds like you have a vacuum leak. When the engine is cold the leak is there but as the engine warms up the parts start to expand thus closing the gaps and sealing the leak. I had this problem on my personal vehicle and it turned out to be lower intake gaskets.
Trouble Code 33 and 34 are the MAF/MAP Sensor
Circuit. It sounds like you've replaced that sensor already. Did you also have the code 34 before putting in the new sensor?
Or did this code start after it's replacement? Any other codes appearing?
Troubleshooting it would depend if it has the Speed Density
Update. The dealer should be able to provide that info.