the carb cleaner was meant to use to clean the o2 sensor i think. just spray it down and wipe with paper towel and reinstall.
also for vacuum leaks keep a fire extinguisher handy if parinoid about doing it but run motor and spraycarb or brake cleaner on the lines. if it runs higher rpm or drops you found the leak. this will also help find intake gasket leaks. has to be flamible spray such as carb / brake cleaner or ether / starting fluid to work.
as for bad tune up, check stuff out. not difficult to inspect and if you got sadistic sense of humor have a buddy hold spark plug while connected and turn motor over. if he drops or twitches its good... but seriously should have visible ark against ground when cranked.
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