What should I expect to pay for a generic hp set of injectors, Im not into the max HP thing as I cant keep transmissions under the trucks as they are, but I would like to know a reasonable price to pay for a set of injectors.

seems like about 350-500 is the "general" price range for a decent set of injectors

What pressure is the LP putting out?

That answer right there will tell you where to spend the money.

stock LP would put out anywhere from 5 to 20 psi. I could get mine to drop to 1 or 2. I've seen IP fail on these motors and spill oil in the crankcase. I had a broken excavator in my yard and half a basement for my garage for a week.

or you could have you injectors tested!!

Leaky injector or injectors is what it sounds like to me..

but
 

Wouldn't I see smoke out the tail pipe if the injector was not popping correctly?

yes, you should see white smoke when an injector is sticking. mine smoked white like crazy when i had my injector hang up

We're talking about a 2nd Gen P7100 truck with a piston LP that should be making at least 30psi if it's healthy. It is not possile for the inline P7100 IP to put fuel in the cankcase. You are talking about the earlier VE rotary IP.