I have a miss at idle on my 350 SLC. I replaced most of the smaller vacuum hoses, but not the plastic lines. I also used carb and choke cleaner to spray around all the vacuum lines. No affect. I did not find a leak. I plugged the main vacuum T at the back of the intake. No affect.

I just bought a new fuel filter, but have not replaced it yet. Could this be a bad injector. Is there a way to test each of the injectors, or should I just remove the spark plugs one by one and read them. I'm sure if the miss is just on one cylinder, the offending cylinder would show this with a plug that stands out.

This is the D-jet fuel system I believe. Any suggestions?

Steve