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May be air leak.
Could be a air leak between the air flow meter and the engine. This would produce a lean mixture at idle and off idle pickup. As extra air is in the mixture that the air flow meter didn't tell the ECU about. Would not affect higher engine speeds.
All the best .
Harvey.
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95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
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