[V8] idlle /driving problem continues

[John Dodd]

Today, finally I received the new FPR. Of course it did not solve the
problem as one of you already mentioned.
To review: idle fluctuates and especially in drive it's much worse.I can
drive the car but at times it feels like I'm pulled back by some
invisible force.It's getting worse so in the last 3 months I drove it
to work 3 times or so.
The code is 2413, mixture adaptation out of range.
 
Since the problem started I also hear a snapping sound from the driver
side so I decided to remove the distributor to inspect the area.In the
process I touched the brake fluid level  electrical connector and it
made the exact same sound.So I said here is the source of that stupid
sound.Put everything back together started the engine and  the snapping
sound is back on even when I applied some pressure to the connector.
Still have no clue on the cause.
Parts I've changed so far  that made no difference 
Ignition wires, MAF(used one so who knows),new  caps (no rotors yet) O2
sensor almost new ,FPR .
Any idea what to do next ?
Thanks