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944 Turbo lack of boost

Engine

Model: 944 Turbo, Year:1986, Mileage:117, Type of use:Street use only
My 1986 944 Turbo has lost it's boost. This happened after the DME relay failed on the car. The only other symtom was it 'stumbling' prior to boost coming on, like it wasn't sure if it was going to, but it would. Turbo spins, vacuum lines replaced where needed. Timing valve replace, DME & KLR rebuilt profesionally. Wastegate checked out and no boost felt when line to WG was disconnected. Boost gauge reads 1.2 to 1.75 & updepending on RPM, but does not boost at 3000. Exhaust is just a couple years old in great shape. Previous owner had put a chip of some sort in it, otherwise it's all stock. Needless to say, I'm at a loss as to what it could be. Anyone with advice, I'm all ears !! Thanks.Dennis

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