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Matt,
I've been having similar problems with my '77 CA 280Z. Here are some other things to check.
1) Get an engine stethoscope or long screwdriver and listen to each of your fuel injectors while the engine is running . If one sounds different than the others it has a problem. Could be it is sticking - could be its electrical connector is bad. If they all sound the same then the injectors are probably fine.
2) When is the last time you adjusted your valves? They need to be adjusted every 15,000 miles. If they get out of whack they can cause some unusual things to happen.
3) Back to the engine temperature sensor and the thermotime switch. They both have bullet connectors in the wiring harness about 16 from the sensors. Follow the wires from the sensor until you see a lump in the wiring. This is where the connectors have been shrink wrapped. Remove the insulation, pull the connectors apart & clean them up. This might help too.
4) double check the condition of your battery cables. If they have a lot of green-white showing - change them out. It will only cost you about $10 for both of them and you'll be amazed at the change.
Not sure any of these will fix your problem but they will at least eleiminate some more possibles.
Phantom.
 
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