Hi! I am currently diagnosing a P38 4.6HSE (coil spring converted) and my problems right now are the ff:
1. When engine started, it will idle for a few moments and would die down.
2. It would only start again if you only take off one of any sensor plugs.
3. When revving engine it would go down first to 200 rpm then go up harshly and when foot is released it would seem to die down.
4. On ROVACOM diagnostics, it couldn't read any fault codes, readings are within parameter and still dies down.
Vehicle is in good operating condition prior to this dying problem. I tried replacing all possible sensors but to no avail. Spark plugs are new and cables.
Please help.
Thanks.