Faulty: spark plug, spark plug wire, ignition coil, ignition module, fuel injector are the most common. Coolant leaking into a cylinder is another.
Internal engine problems such as burnt valve, broken valve spring, bent push rod, worn rings
try changing the cap and rotor
last cylinder on the passenger side
multiple random misfire on 4.3 vortec why?
Number one is the front cylinder on the driver side.
You have to remove the engine cylinder heads to get to the lifters on the 5.3.
Several things can cause your 1996 4.3 liter V-6 engine to misfire and have a vibration. A bad fuel injector is the most common cause.
If it's a V6 it is a 4.3 litre vortec engine. If it is a four cylinder engine it is a 2.2 litre engine.
A Vortec engine can be identified by its distinctive design features and specific engine codes. Typically, Vortec engines have a unique cylinder head design with a higher compression ratio and improved airflow, often featuring raised letters spelling "Vortec" on the engine cover. Additionally, you can check the engine's VIN or look for the specific engine codes, such as the LQ4 or LQ9 for LS-based Vortec engines, to confirm its identity. Finally, Vortec engines are commonly found in GM trucks and SUVs from the late 1990s onwards.
burnt valve...
Drivers side front
If your 1997 GMC 5.7L Vortec has a misfire at an idle but not while under throttle, the problem is likely the timing. This can be adjusted.
No. The Chevrolet LLV (Vortec 2900) engine introduced in 2007 is a 2.9L straight-4 DOHC engine