getting code 43 again, it mentions spark circuit/sensor failure. Car runs, but gets rich on fuel. Any ideas. I have a new ignition module, knock module and PCM has been checked by PCMforLess, all appear fine. I can clear the code, but it will come back again and again.

 

You really should use Shoebox's code list , rather than the generic lists. DTC 43 on an LT1 = Knock Sensor circuit. Either your knock sensor is dead, or the wire is off of it. Pull the wire connector off the sensor (if it isn't already) and with the key on, check for +5V from the single wire in the harness plug to engine ground. With the wire still disconnected, measure the resistance between the single pin on the knock sensor and the block... should be 4.5Kohms. Reconnect the harness plug to the sensor, and check the voltage between the wire and the block.... should be about +2.5V.

If any of those is "off", the wire or the sensor is bad.