GMC Savana 1500 fuel smell and misfire issue after replacing O2 sensors, distributor cap, rotor, and spark plugs on GMC Savana 1500

Some GMC Savana 1500 owners report experiencing fuel smell and misfire issues after replacing O2 sensors, distributor cap, rotor, and spark plugs. These problems may stem from excessive fuel pressure caused by a faulty fuel pressure regulator, leading to a rich air/fuel mixture that triggers gas odors and misfires. Additionally, some owners find that stuck fuel injectors contribute to engine misfires, necessitating further inspection. If misfiring occurs after spark plug replacement, it is possible that the new spark plugs are damaged, which can complicate starting and lead to performance issues. Other potential causes include problems with the fuel pump, crankshaft sensor, and ignition coils, all of which may require attention to resolve these symptoms effectively.