I bought a 2013 Nissan NV2500 V8 with about 60,000 miles on it last week from a car dealership. When I bought the vehicle I used a OBDII reader to check the codes on it and it came out clear. After I test drove I checked the codes again just to make sure nothing popped up and it was still clear. Everything overall looked fine so I bought the vehicle and drove it home (about 160 miles away). I'm going to use the van to do a conversion so for the most part it's been either sitting in my driveway or I drive it about 5 miles back and forth to work on it so besides the initial long haul it hasn't been used that much so far. Yesterday just for the hell of it I decided to test it again with the OBDII reader (something I probably should've done right after completing the drive back from the dealership) and it popped this pending fault: P0303 - Powertrain Cylinder 3 Misfire Detected And shortly after the malfunction warning light came on. After googling around I saw a couple of possible solutions but they range from a few hundred dollars to a few thousand and I rather not spend that. The vehicle is out of warranty and was sold AS-IS. After talking to someone knowledgable he suggested that the fuel that was previously in the van while it was sitting at the dealership might have a bunch of gunk in it and I should try using STP to clean it out and see if that helps so I got some STP and filled it up. So far it hasn't worked since the light came on again, I cleared the code again and I'll see if it comes back but I wanted to know if there are any other ideas that don't involve spending a lot of money on it. Thanks