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I've had the car tuned 4 times in 4 weeks...

eVerytime about 7 days after tune..the car starts to run very course up through the rev band..

Today I had the gentlemen whose tuning it for me...just reset his previous tune and all of a sudden the cars running smooth again...

Any idea of a mechanical issue that would after a few hundred miles (500) would start to allow the car to rev as though the cars motor is starting to tear itself apart?

I'm sorry to ask such a stupid question but thought I'd ask you guys...

Cars running great again but as the week goes on I expect the car will begin to rev up through the rev band rougher..

Right now the cars running the way a car should...

Thanks in advance...for any suggestions..