ok, you may have a Glow plug issue then ( in addition too maybe ? )
take a test light with a long cord, connect the clamp to the POSITIVE post of one battery, disconnect the wires from the glow plugs, and touch the test light tip to each tab on the glow plugs, if the light illuminates, the plug is functioning ( maybe not fully) if no light, your glow plug is dead. the 2 rear on passenger side are gonna be a bitch to get too and replace.
I would suggest replacing ALL the glow plugs anyway.
If you cannot pull the glow plug from the hole, DO NOT yank it out, pull the injectorand stuff the cup with a towel before you break off the glow plug end, then fish it out with needle nose. NOT doing this is a gaurunteed way to end up needing a vavle job due to a glow plug stuck in a valve.