well... quit the spray... and if hes still having a problem... just unhook the maf sensor and see if you still have the problem...

Step 1: Stop shooting N2O
Step 2: Drive around see if you still have the problem
Step 3: if you still have the problem unhook the MAF sensor and drive around, see if you still have a problem. If you don't on the third try then you know it's your MAF. If you still have it it could could be something else, and also your MAF is probably bad as well.

Step number 1st thing you do is get those codes read....