I am getting five red flashes and one green flash from my ecu when I enter diagnostic mode. The engine idles and drives reallly rough. I just replaced all six fuel injectors and that helped out a little. any help would be appriacted. thxs

 

Did you put any sort of silicon grease or oil on the o-rings?? If you didn't, then one or more of the o-rings are probably broken. If this is the cause, expect to be in the garage for a couple hours to take them all out again.
Have fun

 

Code 51 is for a faulty fuel injector circuit - for the California model - per the 90 factory manual. The check engine dash light should also be on.

Good luck,
Tim