Fuel Injector Wire/Connector Replacement

Thanks for quick reply. Here is a picture of two of the four fuel injector wires that I cut off of my truck, as you can see I cut #6 right at the connector so I would have as much wire as possible to splice new one on. The other 3 are pretty much the same length as the other one in pic (If I remember correctly that is) but now the ones I added on those from the junk yard were a little longer. So do you think if I were to re-do it and remove the ones that I already added and replaced with my brand new ones cut down to the size that I cut off in the first place, that it will be okay? And if so, how much of a problem is it going to be as far as running condition and the fuel injectors working properly if I am off on the length just a bit? Also when I did them, I never did soilder them together, just shrink tube. Please let me know what you think I need to do. Thanks.

Okay, I not only read information online but also have had a few different people tell me that the length does matter Extremely. That the total length after splicing in the new wire have to be the same length as originally. So your saying that that is not true? That it will not matter? That would definitely be awesome for sure, cause I wouldn't even know how to measure from the ones cut off.

Okay, I tool it in and had them put on, soldier, and shrink tube my New Fuel Injector wire connectors/pigtails to the harness and my truck runs bad. He said that #5 cylinder was misfiring and that I needed to replace my spark plugs which they were all just barely replaced brand new and wires just recently so I told him no. Well then driving home from the shop my check engine light came on with a P0174 code so being that the truck was running extremely bad I decided to buy all new wires and plugs again and put them on which barely made a difference. The Truck starts right up every time and doesn't sound to bad until I put it in reverse and drive, then it sounds bad and shakes and runs terrible. The longer I drive it throughout the day the worse it starts running. I ran the OBD scan on it and wrote down results, now I know the P0174 is a lean issue in bank 2 but what I need to know is what it means as far as the codes. Now the other day I ran the Live Data set and then ran it again today and got different readings which showed the following:
(The other Day) (Today)
Fuel Sys 1 OL Fuel Sys A OL
Fuel Sys2 Fuel Sys B
ECT 83 ECT 35
SHRTFT 1 39.1 SHRTFT 1 42.2
LONGFT 1 0.0 LONGFT 1 0.0
SHRTFT 2 39.1 SHRTFT2 42, 2
LONGFT 2 0.0 LONGFT 2 0
IAT 53 IAT 38
MAF 0.10 MAF 0.10
TP 19.6 TP 19.2

Did not record O2S11(V) 0.000
SHRTT11 42.2
O2S12(V) 0.000
SHRTT12 99.2
O2S21 0.000
SHRT21 42.2
O2S22 0.000
SHRTFT22 99.2

Now what any of that means I have no clue. Now( the other days )Freeze Frame with "key on not running" read a Load at 70.6 RPM 1604 VSS 66 ECT 92 with SHRTFT1 3.9
LONGFT 1 3.1 SHRTFT 2 6.31 LONGFT 2 13.3.

And will driving the SHRTFT1 and SHRT2 went up and down with SHRTFT 1 0.0 to -0.8 to 16, -16, -39, 61, -2.3, etc. SHRTFT 2 2.3, 21, 08, 31, 32.8 etc.(Not in those exact orders of course)
while the LONGFT 1 stayed MOSTLY at 6.3 while the LONGFT 2 stayed MOSTLY at 14.8.
VSS 0 Sparkadv 14-24

Now If I only knew what it all meant. Please help me...
Could it have anything to do with the length of the fuel Injector wires being too short or too long and therefore not sending the proper amount of voltage through the injectors in the correct amount of time to fire them when needed? That is what I think myself is going on and I really need to know if I am right or wrong on this. Please help me and reply ASAP. Thank you so much.