Engine problem
2004 Audi TT Question Engine Size unknown Wheel Drive Type unknown Automatic 60,000 miles
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Hi,
I have Audi TT 1.8-Litre Turbo.
When I am driving between 60 and 90km/hr and going up a hill the RPM's drop between 500-1000 when trying to keep my speed constant. If I step on the gas a little, it will accelerate and it goes away. It has been getting worse over the last few months and happening on flat roads now. I replaced the turbocharger along with the waste gate, but it didn't really resolve the issue. Any ideas on how to fix this problem?

Thanks,
Tareq