so i have a late 06 ranger with 2.5tdci which started missfiring.

Connected to pc got multiple hits.

p2263 - which is something to do with turbo
p0300 - random missfire
p0401 - egr
p0404 - egr

0401 and 0404 i knew about and have been pooping up for some time. took egr off cleaned but still persisted, i just left it.

i checked injectors with ohm metre and they all tested similar resistance.

tried the camshaft sensor, this is a 3 pin i have about 500 ohms between 2 and 1 and nothing between 1 and 3 or 2 and 3 is it normal?

i used diagnostic test and found out that if i turn injectors 1 and 4 off together the missfire stays the same. If i turn off 2 or 3 engine knocks harder and shuts down. So i m guessing injectors 1 and 4 are clogged?

could the issues be coming from leaking egr? should i take injectors 1 and 4 off and clean them?

Thanks in advance