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V35 350GT bad idle and stalling


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My friend has a 2005 V35 Skyline 350GT. It has been stalling coming up to lights, but only if you accelerate quickly and then put the brakes on. The idle is shaky and feels like the car will stall. 

I know the Cam sensors have been replaced in the last 50,000km, from what I've read online the VQ engines quite commonly have issues with these and the symptoms this car is having is close to this. But I'm not sure as I don't believe there is a way to test this? 

I have pulled all the plugs out, nothing wrong on the ignition side of things. Compression is good at 180psi over all 6 with a variance of 5psi. Replaced with new plugs, and good coils same issue. 

Can not find any vacuum leaks, cleaned the MAF sensor and have replaced the fuel filter for good measure. 

The car has 175,000km on it is there anything I am missing to check?

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6 hours ago, GTSBoy said:

In which case, when was the last time the TB saw any carby cleaner?

Ended up finding the culprit the right side bank cat was completely clogged I'm surprised the motor was able to run as well as it did. 

Replaced it with a hi-flow cat and idles perfectly. 

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