93 accord wont start

Help
ok my problem started about three weeks ago
I was running my car and it started stumbeling at higher rpms.
Then when I started my car the engine rotated and would stumble to turn on.
I then changed the spark plugs 5 days ago.(Noticed they were all white at the tip and burned at the bottom) asked the guy at pepboys and he said its probably faulty fuel injectors.
So I bought fuel injector 3 days ago and it made the problem go away(good start and no stumbeling(slowly went away)).
Everything was fine until yesterday.
The car wouldnt start so I adjusted the distributor to the tdc and got the stubling effect agian(so i got happy cuz it would start before like that), but never started.
The car cranks, and wants to start. Something is keeping it from kicking over.
What could it Be?????????????????
Distributor most likey or ignition coil?(my homie that works at Pepboys said that)

cracked head never mind folks