Changed my oil and Started my car for the first time and let it warm up, no problem. Running perfect! Idled until 200f and then shut if off. After an hour started the car up again and and off the boost gauge was bouncing -18 to-10 and on the a/f gauge it shows that it's running really lean . I'm going to try and change sparkplugs tomorrow and fuel filter but not sure if it will help .has this happened to anyone?

 

General rule of thumb is to check the "in's and out's" of the car - such as intake and vacuum lines (do a smoke test if you have the availble equipment) or just use an air line to slowly pressurize the vacuum system to check for leaks. This is all done with the car off btw.

Then check fuel - make sure your fuel filter is not plugged, injectors not plugged, spark plugs are gapped correctly and proper heat range, fuel is not old and is of good quality. Then go from there.

 

I would recommend checking the map sensor