I have a 99 spyder GS automatic (4g64) and was originally throwing quite a few codes including one for injector circuit (had a bad injector), misfire same cylinder as injector (pretty obvious if an injector is bad), p0125 (coolant sensor I believe), a p01750 (shift solenoid), and a p0340 (cas?).

so I bought it for $300, limped it home without checking the codes, changed the pulse generator (that was the original code) and it seemed to run fine for a day. I shut it off and when I started it back up I got the injector and misfire code. I cleaned the injectors, put them back and was running good for my next trip. I shut it down and the codes were back. I left it sitting over night and in the morning it started up and ran fine. Same thing happened on shut down but was then introduced to the coolant level code. So I checked the thermostat (previous owner took it out), installed a new one, cleaned the connectors for the coolant sensor, changed the CAS with a new one, fired it up and it ran for about 4 seconds and shit down. It did that twice and on the third time I got nothing and that’s currently how it sits. Now when I go to crank I don’t get anything besides a little hum and click from the start relay. I checked the start relay and have continuity, checked the started 4 times at Autozone, switched back to the old CAS, checked all connections and tried again with no luck. So I checked the CAS harness at the sensor and seem to be getting voltage (hopefully I’m doing it right) I put my common to the black wire and my positive to pin 2 and read something like 5.3v but the weird thing is, I checked the output from the ecu and got no voltage at all. I believe I’m doing it right but am just not positive, I looked up the schematic and went in the back side of the plug in the ECU to the CAS wire and the other to ground and got no voltage reading. Am I doing something wrong? I’ve read countless threads and seem to be on info overload so hopefully someone can point me in the right direction. Thanks in advance!