2004 Nissan Quest with engine code P0300

Question

Hello i just bought a 2004 nissan quest. The service engine light came on.At first the only symptom was just a misfire.Had the code read it was (P0300). The next day while driving, it started only driving 40 mph or so.
I was advised to replace all the spark plugs and coil packs. That has been done. The misfire is gone but the car still wont drive over 30 or 40 mph. What else can be wrong? No other code has shown up. Thanks

Answer 1

Unfortunately there are many things that could cause that problem, from bad gas to a defective transmission. I suggest to have a technitian furter check your Quest.