Codes PO700 and PO129

my durango has had lack of power, bad gas
mileage,  weird idle when stated, hard time
starting as the it seems to stick when
cranked then i turn it off and it will start right
up, i have put in a new battery, alternater,
changed map censor, replaced pcm. The
check engine light goes on and off and a
few times the red lightning bolt light comes
on and flashes and it runs like crazy almost
stalling. When I turn the car off it goes away
and seems to run ok again.