02 Town & Country Stalls and dies driving, idles rough

I've spent SO much time looking through forums
but never found a specific answer so here goes: I
have a 2002 3.3L flex fuel T&C (230k miles and no
egr) that stalled out and died completely when
driving. Got codes (intermittently) for cam sensor
which I had replaced (eng light had been going on
and off previously and would read emissions recirc
something or other). Got it back in the expressway
(was out of town of course) and it died
again...restarted it and got it almost off the exit
ramp and it died again, only this time it wouldn't
restart, and the gauges were spinning and the dash
flashing.  Looked like the battery was leaking, so
replaced that and it drove fine for about  5 minutes,
then died upon take off again (crossing a busy
street-yikes!). No other codes showed up, and on a
diagnostic test drive, the car died, and again, no
codes. Replaced the cam sensor also, but it still
dies repeatedly after about 5 minutes of driving
and has a very rough idle.

Been told the next step is replacing the ECM which
I found for $100 with a lifetime warranty on eBay,
but told mine might not be bad. Should I have all
the wiring checked or replaced first or is there
anything else I should check? How many wires are
there and how expensive is it? Also one other
funny thing a out it is the ignition tumbler is
messed up to where you can remove the key while
the engines on...wondering if THAT could be
related?  Just can afford to dump a ton of money
into this...any help is appreciated!