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glowing hot exhaust manifold, misfiring amongst other problems

  ph2 172
Hi guys.
My bother in law has a 1.2 ph2 16v. The car can start, but will hunt and miss but if I mess around with the sensor on top left of the airbox we can get it to run smooth but over rev, turn it off and start it again, the problem starts again. However after noticing the car feeling very hot I've noticed the exhaust manifold glowing red hot. Anybody got any ideas, diagnostic comes up with 2 o2 sensor faults which I'm guessing is the lambdas.
  alien green rs133
throttle body will be fecked, also check wiring harness, if its the original molded rubber harness it needs replacing.