Well, I've learned a lot about this engine and it's parts in the last few weeks.
I've found that no you don't need to remove the timming belt to change the injectors.
Also it's easy to check the injectors. Which I did and found that none of the terminals were shorted to ground. Also the harness rail wiring was also good.
Also I had to remove the EGR valve to remove the cyl head cover to get to the injectors, and found the valve so coked with soot that I couldn't even see the probe that sticks out into the intake flow.
I cleaned the valve and reinstalled everything and now after 250 miles it runs great!
After 240K miles this is the first thing I've had to do except get that dog collar plate to keep the intake hose installed.
After reading about the injector piezo valve I can see why a lot of people told me they never go bad, nock on wood. And I have also learned a lot about the EGr valve, after learning it's function I can see it causing the problem that I had. I think the fault for the injector was induced by me when I switched the engine off and on while I was rolling.
Time will tell but I believe it was a good fix and saved myself $1900.
Thanks for the help