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Boost problem?

I was driving along the other day and i thought i'd give the car some juice. It started boosting as normal but then suddenly at about 4000rpm---judder judder judder...like fuel starvation or something.

 

Current setup is a JWT ECU with 13psi boost.

 

Any ideas????

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    Ford turbos used to do this when the the fuel pump was on its last legs. It happened to me a couple of times.Never had it on my Z though.

    Maybee your fuel filter needs changing.Also check for crap connections on the coil packs

    Paul

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