Just need a bit of advice on my 182! -Eml is on, diagnostics reads precat O2 sensor -35 Mpg on long run compared to the 43+ I was getting in my 172 Cup -Pulls hard to 5k rpm then becomes flat and strained. Noticeably dips in power -idles fine, no spluttering or misfire Is my front lambda sensor shagged? I thought it might be a blowing exhaust but that was welded up and sorted. I am getting a slight whistling noise as the revs climb, just under full throttle. Car is standard apart from cat back Scorpion exhaust.