Injector trouble?

[TPringle]

I have a post in truck 911, dead truck in Mexico. My truck is a 1992 W250, 4x4, 12v, ext cab. Auto w/ 3.54 gears. I may have messed up by having the injectors checked and cleaned (was done by a reputable firm). After a 3rd attempt on 2 leaking injectors, they told me that I should put teflon on the threads of the return line bolt (going into the injector). They look like they leaking from under the large nut that holds them into the head.

I am going to try what they suggested. If I end up having to get a set, do you have any recomendations? I have no knowledge on tips, brands, where to order, etc.

The truck is completly stock except for a gutted muffler. I dont want to up the power much beyond stock (then there goes the trans), but want to install something that will be efficient/economical.

I had the injectors checked because the economy had fallen from low 20's down to about 13. Idle speed has also dropped, but I dont know if that was a result of the injector problems. I had tried different things to correct, change all filters, clean the coolers/radiator and check the connections on the turbo/intercooler. No change. Power seemed off some, smoke seemed up, even after punishing it a few times. Tried injector cleaners, some used ATF, a little gasolione, u name it. Checked lift pump. Figured best place to start was the Injectors, since the system has about 100k on it. Truck has 350k. Any thoughts or suggestions?