1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar. There were EGR valve issues on some of these vehicles where te EGR would stay on and cause hard starts, rough idle and stalling. Google chrysler tsb # 18-020-01. If the intake manifold gets hot to the touch after a few minutes of starting and idling from cold, the EGR is dumping exhaust into it and that may be your problem. Even with the vacuum hose removed from the EGR transducer diaphragm, if the pintle valve is remaining open it will continue to allow exhaust to pass.
A service manual with wiring diagrams may be your best friend in determining why and what someone added wiring to in the engine compartment for. You may have to undo what someone did to find the root cause.
The 1995 JA body is an OBD II vehicle, so you should have the underdash plug for a generic scan tool. If you have access to a generic scan tool this can ease diagnosis by watching target idle/actual idle, IAC steps and O2 voltages, etc.
Obviously someone was trying to raise idle speed. The PCM controls idle speed through the IAC. The 'minimum air' adjustment screw on the throttle body is not an idle speed adjustment screw and should never be tampered with. It needs to be set back to where it was, the cardboard shims removed and the real problem found.
A service manual with wiring diagrams may be your best friend in determining why and what someone added wiring to in the engine compartment for. You may have to undo what someone did to find the root cause.
The 1995 JA body is an OBD II vehicle, so you should have the underdash plug for a generic scan tool. If you have access to a generic scan tool this can ease diagnosis by watching target idle/actual idle, IAC steps and O2 voltages, etc.
Obviously someone was trying to raise idle speed. The PCM controls idle speed through the IAC. The 'minimum air' adjustment screw on the throttle body is not an idle speed adjustment screw and should never be tampered with. It needs to be set back to where it was, the cardboard shims removed and the real problem found.