My Audi 1.9 tdi quattro hesitates between 1800 rpm and 2500 rpm. After the turbo kicks in it goes very well and below 1800 it seems to run ok.
The temp gauge also varies between 70 degrees and 90 degrees. It's had a new Air Mass Meter fitted, fuel filter and had the fuel system flushed. The mechanic said that he thought the intercooler could do with flushing.
Any ideas please?