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Hi guys,

Just after some help for my r34 gtr..

It was fine last time I drove it and has been parked in my shed for the past 3.5 months while I have been working away. Today is the first time I have driven it since and it started all fine, drove it for over an hour all good, washed it at the car wash and as I was parking it up to shammy it dry it was hunting up and down almost to stall from 950rpm-609rpm (power Fc). I have since driven it home and all was fine when driving, only at idle it does it.

I put the a/c on the problem goes away and I turned the a/c back off and the problem was fixed for awhile i turned the car back on and the problem was there again.. so I decided to clean my z32 Afm's and no difference in the idle.

Could it be stale fuel causing this problem?

I don't think it's the afm's ..

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Hi Choyda,

It's only a brand new fuel Walbro 255l pump installed by my tuner 5 months ago

I hope it's not the pump.. But then again it has been sitting for a while..

Not really running overly rich I would just say normal

With a PFC there's often a problem with the hot start and not with the cold start.

It tends to happen when the car has been standing for at least half an hour to a couple of hours after a run. It can take a few seconds after hot starting for the PFC to catch on.

Your tuner might just adjust the idle for you within the narrow boundaries of what a PFC will permit.

Hope this helps.

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