Oil light/won't start

I pulled the PCV valve out, the grommet crumbled, before I put the new one in I tried to start it thinking it may push out any matter that was left in there after I thought I had gotten it all out. It turned over but did not start for about 3 seconds. Then turn the key and nothing. Today I took it all apart and did valve cover gaskets, manifold gaskets. Coil packs, wires, etc. I shop vacd the both heads and didnt get anything, I dont think. I put it all back together, and nothing. Oil light is on and will not even try to start. Has plenty of battery, I pulled the efi relay for an hour, as directed when performing a tune up. Pulled the starter relay, and disconnected the battery. Still nothing. Help please and thank you. 2000 3.4l

 

Are you saying the engine turns over but won't start, or just nothing is happening? if nothing is happening you either have a bad battery or bad starter. if it's turning over and not starting perhaps you've got something unplugged from the repairs, most common thing left off is the ground on the drivers side above the #2 cylinder.