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Please my 407 (petrol) engine has been misfiring at random, sometimes it runs normal while most times it misfires. I have changed the fuel pump, plugs, coil and nostles. But this did not fix the problem. on running a computer diagnosis it came up with the following errors
1. significant combustion misfiring on cylinder 4
2. Injector supply signal 4 open circuit
3. Injector supply permanent signal 2 open circuit
4. Air pump relay open circuit
5.Pressure/Throttle intermitten position incoherence ent.
6. Clutch switch signal permanent malfunction
7. Fan assembly (GMVI) intermitten relay

Please if anyone can assist on how any of this errors can be fixed I will really appreciate it.
 
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