New theory

Ok ive tried a million things to get my car to start up like new or just better and after reading the thread about the guy wanting to replace the fuel pump do to the hard starting, i realized we both have changed basicly everythin that affects starting except the intake. When i changed my spark plugs this week they were black and according to several people that means im running rich(too much gas to air ratio).
Now that could be caused by a hundred things. But i have heard over and over again that our stock intakes are very restrictive. So help me out here do you guys agree that a restrictive intake allowing less air into the engine could give the car problems starting.

By the way doodad i changed my spark plugs this week and although it was a pain in the ass i got it done the hardest one was the deepest one on the passenger side. it has to be done from the bottom and you have remove the starter.

Does anyone have any ideas, it would be very needed and helpful. Now that i think about it my plugs were pretty bad also, and they were only in there for about 40K miles