99 nissan quest p0301, I replaced the sparkplugs already and im still having the same code, whats could it be?

Here's a link on your trouble code,301 is cylinder 1,302 is cylinder 2,303 is cylinder 3 and so on. P0301 Jeep Cylinder Misfire Fault Detected

p0301 is a misfire in cylinder # 1 replace that coil pack ,regaping plugs won't cure it

most likely timing belt failed.this turns camshafts which in turn rotate distributor.fotunately for you ford insisted nissan make this a non interference engine during their joint venture with mercury villager.so no internal damage should have occurred.im guessing about 700.00 to replace timing belt,water pump and drive belts.

http://groups.yahoo.com/group/villagerquest/

Need a new reamn diistributor from ebay - Rich Porter, $200. Common problem for 99 villager and quest

http://groups.yahoo.com/group/villagerquest/

CAMSHAFT SENSOR BUILT IN THE DISTRIBUTOR.

On the Nissan that code means you have a short in the knock sensor circuit or you just need a new knock sensor.

first the quest, this is common for nissan, replace the knock sensor, this sensor is located under the intake manifold rear of engine, some models you can sneak sensor out without removing the intake, this will take care of that car. now the camry, im guessing this is a 4 cylinder engine, replace the air fuel sensor (oxygen sensor) thats on the exhaust manifold. this will solve that problem. hope this helped.

even though the parts are new they can still be bad the calipers are sticking have him replace them at no cost due to part being bad if he says no then go elsewhere

I pulled the cylinder head and it has a crack in the third sparkplug department, so I am going to replace it with a used cylinder head.

Thank you.
Jameel