2000 astro sputtering

my astro is now causing a dtc p0300 what can I do to check for the misfire??? It sputters in idle and when you take of. please help!

P0300 is usually caused by problems in secondary ignition: plugs, wires, cap, rotor or ignition coil. Problems with fuel pressure can also cause it.

changed cap and rotor and will be doing wires, tommorrow, fuel pressure was ok. how can i check the coil?

Fuel pressure must be 60 to 66psi key on, engine off, pump running. After pump shuts off, pressure must remain above 55psi for 3 to 5 minutes.

Use a spray bottle with water, and direct a mist over the coil area when the engine is running, and watch for stray sparks. If you do this at night, it's much easier to see the sparks. Without special test equipment, this is about as high tech as it gets!