Sure you typed the right code?
Sure it wasn 't P0171?
This is a system lean code....if this is the case have you checked for vac leaks with carb cleaner.....if you did a tuneup, did you pull the PCV valve and forget an o-ring? What is the fuel pressure?
Whenever you have P1XXX, that is a vehicle specific code by the manufacturer, so I'm assuming that it's similar to P0071, which is your ambient air temp sensor, which I believe is the sensor in the snorkle to the throttle body.....