Its more on a account for the MPG i get which is around 16mpg highway and car seems a bit slugish at times,Such as going up hill not a turtle but feel like it needs too much accelertation. Indeed this is a mechancal injection and no where comparable to electronic injection still feels sluggy. The fuel filter was replaced and all the screens such as the one attached to the feed on the gas tank, the inlet on the FD were cleaned also the eha screen. Also just put new injectors because of 2 squirting and not spraying properly. I used a test by the mercedes manual to check FD flow and it seemed to be ok. The voltage to the eha and o2 do not seem low to you?? almost like its working on 85% of its capability