I recently had a p0301 Code, i cleared the code and drove the car for around 100 miles. got the same code back, cleared again drove another 100 miles no engine lights, I ordered the plugs and coils, i just removed the spark plug and the coil from cylinder 1 they look fine. here is the pics. going to change all six. any advise? car runs strong no problem not sure why i got the code. by the way cylinder 1 is the passenger side towards front of the car correct?