Need some advice Eldorado 4.6 ETC late 93
 

Does anybody know where I can buy a new front windschield molding (kind of black rubber wirh chrome strip in the middle) ? I asked the Roger Penske Ca dealer where the car was bought new but got no answer.
I recently discovered a technical issue, it appeared clearly with the cold weather :
Engine starts fine, slightly hesistating while idle cold
Once I touch the gas pedal, RPM increases up to +/-1400, engine sounds like too much fuel or not enough as if some cylinders do not fire up. Check engine light comes up if running idle for a whike but not when driving until hot.
Once the engine is at normal operating temperature, it runs fine, idle is OK.
I cleared ODB codes by disconnecting the battery.
Afterwards (the engine was still hot), I drove the car and pulled OBD codes :
P052 history (PCM Memory Reset)
P109 history (Keep Alive Memory (KAM) Reset/PCM has lost primary battery power)
The next day : cold start. I drove the car about 3 miles (freezing temperature outside), normal temperature was not reached yet and I had to stop to answer a phone call. I kept the engine running idle during the phone call, the Check Engine light came on. I drove the cas until normal operating temperature. Stopped and restarted the engine : Check Engine went out.
The next day I pulled another OBD code :
P030 history (ISC RPM out of range)
Something else : powerbreak is not very strong

Could this all be related to a vacuum leak ? Is there soething else or in particular I should look at first ? Any expert advice from the connoisseurs will be very much appreciated. Will I find answers in the FSM for this ?

Original mileage: 71.000