Rough High Idle

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Aug 24, 2007
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Om my FZJ80 (Aussie spec), I notice a rough idle when the air-con kicks in - this picks the revs up to about 1000rpm. At first I thought it may be the air-con pump, but if I bring up the revs to this point without air-con, the roughness is still there. Listening and feeling exhaust pulses, it does not seem to be a misfire. Any ideas?

I must add that my fuel pump is at an end as there is low power below about 2800 rpm but after that it takes off like a rocket (OK, a very heavy rocket). Bypassing the fuel pump resistor fixes this problem but not the rough high idle

There is no other roughness or missfire at any revs
 

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