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Richard,
You didn't mention your MY, so I'll assume that your DME is version 7.2.
For a P1130, there are several fault areas to look for (as you know, that code applies to idle range only):
1) Incorrect signal from MAF sensor
2) Intake air system leaking
3) Fuel pressure too low
4) Volume supply of fuel pump too low
5) Fuel injectors fouled
6) Exhaust system leaking
The proper way to troubleshoot this in in these steps:
1) Check the signal from the MAF sensor
2) Check the exhaust system for leaks (leaks ahead of the front O2 sensor can cause LTFT issues)
3) Check for leaks in the intake
4) Check fuel pressure/volume supply
5) A fuel injector on that bank could be fouled
I also sent you a PM.
Regards,
paul...
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