Injection pump 3.0 TID

Hello dear Saab – municipality, have the following problem: a few days ago my 9-5 / 3.0 TID suddenly had no power after the start of the engine. From about 2000 rpm. the engine started to stutter and you could not give any more gas. I drove at the time the BAB, top speed about 90 – 100 km/h, nothing went over it. So down from the train to the country road. After about 60 km. Drive everything was normal again. On Thursday I drove then to my Saab workshop, there w The pressure of the injection pump was tested. This should normally transfer 60 bar, with mine it was only between 17 – 40 bar. Curiously everything worked again after leaving the workshop. As it looks like the injection pump is defective. Cost of installation approx. 2500,- €. My question is now: is the effort still worth for this engine ? moreover it needs for some time about 1.0 – 1.5 liter. cooling water on 2000 km. Cylinder head damage ?? Until the above time the Engine impeccable despite about 200 tkm. Inspections were all made. Many greetings eckhard123