V-6 4.3 Good battery and cranking power. Fuel pump seems to be working (has presure). Worked well yesterday. Today won't start. It acted like it wanted to once. Acted like a flooded engine wanting to start. Let sit and nothing new. just wants to keep cranking away. Help!!!!!!!!!!!! Thanks Ed

 

You need 55 to 60psi fuel pressure to start and run the engine. You can only check that with a fuel pressure guage which you can purchase or rent.
Have you checked for spark?
If you think it's flooded you can hold the gas pedal to the floor while cranking the engine to clear the flood.

 

Bought a odc 2 3100 it says p0102 or MAF problem. bought a new MAF and it at least tries to start nowbut thats about it. Any ideas now? help!

 

Here are a few things to check for:-
A restricted air intake duct-
A collapsed air intake duct-
A misaligned air intake duct-
A dirty air filter element-
A deteriorating air filter element-
Any objects blocking the air inlet screen of the MAF sensor.-
Any debris on the sensing elements of the MAF sensor.-
Any vacuum leak downstream of the MAF sensor.-
A MAF sensor that is installed backwards-
A restricted exhaust system. [align=left]Also, check the wiring harness connections and the ground connection.[/align]