Need advice
I have my 5spd SE sitting in the carport for about a week 'cause I am out of town. So, this morning I got it started to go to work and suddenly I heard a loud bang from the engine.. I was so shock.. what the %$#* is that. so I get out from the car and start looking around open up my bonnet and everything seems to be normal, although I smell the exhaust rather rich in fuel, and again this is normal in the morning. So, I have no idea what is going on?

is this a common symptom for almost 30k car with reputable badge like nissan?

if you have any suggestion or similar issue please let me know.

Thank's