No or low spark #4 and #7 plugs

[ZR1Vette]

Your doin good.... Jeff and Tom have covered things in comments...removing fuel rail/injectors... key is you want to remove the fuel rail with the injectors attached thus what you will be doing is removing the injectors from the injector housing seats. Again, using a simple tool such as shown here>>>


just work front to rear and rear to front gently and slowing prying up a little at each pry spot and injectors will slowing unseat. Do NOT just pry up at one spot until injectors pull out because you take a chance to pulling an injector from the fuel rail which means you could damage the injector seat clip holding the injector to the rail...in this pic the clips can be seen where the injectors seat into the fuel rail.



You will need (as in a strong suggestion) to replace the O rings for the primary injectors ONLY (secondaries come with O rings as part of the injectors themselves)... I use a tool (Sears) as shown to carefully pull out the O ring...then clean seat with cloth soaked in parts cleaner...then install new O rings.


Found a little trick (for me anyway) to re-install the back two ignition module plugs... after you lay down the plenum and install the two front ignition module plugs and prior to reconnecting the front (under the plenum) vacuum line simply push forward the plenum slightly (as shown here)>>


and install the plugs (that little 1" movement forward makes getting to the plugs etc sooooo much easier)...once plugs are installed then slide plenum back into position and slightly lift front of plenum to install the vacuum line.

Hope this helps a bit