so far my truck has
6637 intake
3in dp 3.5 straight no kitty
14k mod and 140v idm
also have a stock 99 intercooler mountedand will finish when doing injectors
could i run stage 2s?
or should i stick with 1s?
and last what will they do for fuel millage?

 

Stage 2s but do you have enough high pressure oil and boost would be the question.

 

I'd do twos but you'll need a chip and HPOP

 

mpg going to change much? get any better? i go threw my front tank in 220 miles 19 gallon tank 11.57 mpg im suspecting worn injectors truck does have over 200,000 on her

 

When I put my ones in my MPG's stayed the same 17.5

 

If you are lookin for mileage I would say new injectors would certainly help if you got tired ones... but you could also try to...
1) clean your fuel bowl... do the rebuild etc.
2) If she is jacked up at all...get rid of the lift and large tires.
3) Run Diesel Kleen ALLL THE TIMEEE! Grey or White bottle dependin on time of the year.
4) Get a chip and have some good tunes put in er.
5) Get bellowed turbo up-pipes to ensure you dont have exhaust leaks at the 'donut' gasket... or ever will have leaks there again.
6) Keep yer foot out of it and only drive highway miles at 65 cruising behind a semi..

DO IT NOW!
lol no but seriously other than #2 and #6.. all of those should help your mpgs a little bit.
well #6 kind of applies (dont drive like a maniac).

 

Are you actually throwing 19 gallons of fuel back in when you fill up?

 

That's what I average in town driving like a mad man. I just changed my fuel filter and am now gonna try running white diesel clean to see if my MPG goes up.

 

I get 12 with diesel kleen, 15 without...

 

If you do not plan to upgrade the turbo and fuel system, there's no point going larger than Stage-1. There are hp gains to be had even with Stage-1's and adding larger turbo, fuel system, intercooler, etc.
If you're keeping everything else stock, just add a Super Duty HPOP and good tunes and that's about all the truck can really take.