P0325 = Knock Sensor Circuit Malfunction Check the wiring to the sensor, it may be unplugged or have a bad connection. If you have a scan tool that can watch live data you can sometimes watch the knock sensor signal and tap on the block next to the sensor to see if it reacts. If the engine senses a constant knock it will retard the timing.
Check the distributor, With it installed bring #1 up to TDC. Now rotate it so the timing pointer is around 15 degrees. Does the rotor point at # one post? If no will it rotate so it does? If not you need to re-install the distributor. If it does line up, you have a different issue.
Check for a vacuum leak as the issue of missing at idle that goes away when you rev up is a classic symptom of a leak.
Monday, March 20th, 2017 AT 5:11 PM