I need all the reasons for a misfire. could it be opti? wires? plugs? anything else? leme know...

 

yes to all.

when does the misfire happen?

 

this happens when im at about 1/4 throttle in any gear besides first basically. or at low RPM's.

 

bad/plugged EGR valve or manifold passage can cause that as well.

 

check for arching

 

please explain arching to me...

 

park car in like a dark garage and look to see if you see electricity/(arching) coming from your plugs or wires or coil -

im having similar problem now and brought car into garage to see that 2 plug wires have cracks and are arching against the block causing misfire. i have new wires just waiting for chance to put on