"since the first of the year I have bought 36 4.3’s and 27 of them I replaced the manifold and resold"

Are you serious??!?!That's hilarious man.

 

Okay, I'm here lookin' for help. I've done most of the things talked about in the thread already; tune-up, replaced FPR, Fuel Pump (twice), checked for vacuum leaks, and I still have a problem. After replacing the fuel pump again the car we have solved the problem of having to crank the motor for 5 to 10 seconds before it fires; and motor seems to idle and cruise just fine. However, under a load there is an occaisonal single miss. Car was put on a scope with no apparent problems so of course the shop's answer is, "could be a tune-up, could be the spider injectors". Any thoughts?

Oh yeah, where do I connect the fuel pressure gauge?