On my 95' Trans Am I get a code 33 at idle in gear, if its in park or neutral or moving it goes away. On my scanmaster the map reads 19 while driving steady or in park/neutral. It reads 25-26 while at a idle in gear. I have a aggressive cam and such. It didnt do this until I turned the 02's back on and put a different nitrous plate on. I see no vac leaks either. Any ideas?