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two things to try...
first, locate the banjo bolt at the back of the intake manifold. trace the line from it to right behind the brake booster, thats your boost pressure regulating valve, take out the banjo bolt, clean any carbon from it, take out the sensor near the rear of the intake on top and clean it out too. next, undo the two vacuum lines from the valve and conect them together (the other end goes to the injection pump). If this fixes the lag problem, just replace the valve.
your other problem could be lack of fuel. if new fuel filters dont do it, take off the fuel line at the prefilter and blow compressed air back through the line to the fuel tank. drive the car, if its better, the fuel strainer at the bottom of the fuel tank is getting clogged, or the fuel line itself after the strainer is getting clogged. buy some diesel doctor, dump that in a full tank, drive it till near empty and then replace the strainer and fuel hose at the strainer.
good luck.
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