very odd problem

well today i put all the plugs back in and hooked up the fuel injectors, but i left the cold start injector unplugged. it didnt do anything. i think it ran smooth for like 2 seconds and then started running rough, i turned it off, plugged the cold start injector back in and started it and it just ran rough again. then as it was running i unplugged the cold start injector, and i unplugged the fuel injectors one at a time and even that didn't do anything to change the idle of the engine. the smoke actually does have a blu-ish tint to it, but its mostly gray. its not dark smoke, its pretty light, so its hard to tell. i dont know if its gas or water or fuel or what. even when i give the engine gas, and get it up to a higher RPM, the engine still runs rough and feels like its going to die. how would i be able to test if it is the temp sensor? where is the temp sensor located?

i dont know if this is related at all.. but my engine temperature/oil pressure gauge seems to be broken. when i turn on the car, the needles move very slightly.. so i know the gauge is not disconnected, but when the car starts, neither of the needles move. maybe this would be an indication of a broken temp sensor? i really dont know. what do you guys think?