engine codes on 1992 Chevrolet Lumina APV

i just purchased this van and so far i have put a TPS and Cooling sensor on it, and it has a rough idle and the check engine light blinks on and off, and shows a code 15, any ideas?

Asked by for the 1992 Chevrolet Lumina APV
1 answer
How is the engine temperature, is is normal? How about the wiring and the connector at the temperature sensor? Are you sure there is only the 15 code?

DTC - 15 Engine coolant temp sensor error (low temp indicated)