Hi, I'm new to using any sort of code reader/scanner but bought this tool to try and diagnose a misfire. Initially I has d historic codes P0304 Cyl4 misfire and P0313 Misfire with low fuel level. I re-seated the HT leads and reset the throttle position indicator These were cleared and have not come back. The car drives much better. However, when I set off the engine attempts to die and I have to slip the clutch to stop kangarooing down the road! I get a x or inc for the cat and the o2s sensor even when the car has warmed up to normal temp. Does this mean the lamda sensor is suspect? Thanks for your help