recently my 01 4.8 just started doing this: sometimes it starts just fine, sometimes it starts and hesitates, hardly idling to the point where it will turn off. I've been turning the key forward and letting the computer "set" before starting the engine and it seems to help but today it did it so much my battery drained. I've been told it could be a bad ignition but wanted to ask you guys for some advice before I spend some $$$.

 

I forgot to mention that there is no codes reading out ... all cluster lights are clear

 

Need to do a pressure check .. no codes usually means fuel pump.
Should get 60 to 65 psi , and hold . Even off a few psi .. will get long crank time
or no start.

 

Found it was a faulty battery connection. The thread was bad. Easy fix