2002 Pontiac Trans Am LS1 Misses Fire with P0300 and P0101: Open Circuit Fuel Overflow on Passenger Side
I own a 2002 Pontiac Trans Am with the LS1 engine. The vehicle is throwing fault codes P0300 (random misfire) and P0101 (mass air flow sensor circuit range/performance problem). I've already replaced the spark plugs, coil packs, ignition wires, MAF sensor, and performed a compression test—results show no issues. However, the engine consistently misses on cylinders 4 and 6 only. There is an observed fuel overflow on the passenger side bank, and the system reports an open circuit condition. What could be causing this specific misfire pattern and persistent fuel flow issue? Any insights from owners of similar LS1 engines?
Could be a stuck-open fuel injector, especially on cylinders 4 and 6. Have you checked the fuel pressure and confirmed whether it bleeds off when the engine is off? This would help determine if there's a leak or faulty injector causing the overflow and misfire.