01 mustang gt dropping passenger bank.

I've had problems with this car since
I bought it. At first it was just a miss.
Had it in the shop to many times to
count. Finally the miss caused it to
throw a rod and bearing. So
rayskillman had to replace the block
with a new reman long block. Which
was installed in 3/18/15. Still had
problems after that. Within the last 3
months I've replaced: coil packs,
rubber boots and springs to the
coils, intake manifold and gasket,
IAC motor, oxygen sensor, fuel
pump, filler neck and groment to the
tank. I put a new mass air flow
sensor but it didn't fix the problem
so I put the old one back on.I just got
it back today from a ford dealership.
They told me its dropping the entire
passenger side bank. And that they
couldn't figure out why. Unless that
started to trace down all the wiring in
the car. Which I couldn't afford. ive
had this car to 4 different shops
within the last 2 months and no one
can figure it out. If you have any
advice or idea what it could be
please let me know. I'm all out of
options