04 6.0 runs crappy in high heat

[72nova434]

my 04 f250 was running great till we started having 100+ deg heat.
it starts to load up after driving for a about ten to fifteen minutes i have to put into neutral to get it to clear up while it smoke like a train out the pipes. once it clears up it runs ok for a while then it starts all over gain. runs great when below 90. no issues at all
i also run rev x fuel and oil treatment,
what do you think?

[southend]

I think you need a monitor solution before you run it to failure. It may be defueling to prevent further damage? Ford did prethink some scenarios.

Sent from my SCH-I500

[72nova434]

had codes po 299, po 472.

replaced my exhaust gas back pressure sensor , cleared codes ran koer test scanner past all test, ran balance test ok map sensor in range fuel spec good . injector module 47.8 volts. test drove 40 miles in 100 deg temps ran great.