1988 5000 cs start and run problem

[Jim & Michelle]

Hey dudes
My son recentley bought a 1988 5000 cs turbo.  It's been nothing but trouble from day 1.  To date he has spent in excess of $1500.00 to two different repair shops, the second shop being owned and operated by a German Mechanic which replaced fuel pump, cleand fuel tank, dist. cap amoung other things all of which I'm not sure.  Anyway the car had to be hauled away from his shop on my trailer, the mechanic basically saying the car can't be fixed.  I'll have to say I've never heard of a non repairable mechanical problem.  I;m now attempting to talk to some of you to see what your ideas might be.  Here's  the symtoms I'm aware of since I've got the car.  most of the time the car starts and runs as long as I don't let the tach fall below 1500 rpm,  occasionally the car will idle on it's own and acually run good, and will start back when turned off, however you may try the next day or that evening and it's the same old thing all over.  I've tried to run the codes but it has no code in memory.  I really don't know where to look if the ECU  (which was supposed to have been replaced) has no info for me.  Oh yeah the coil was also replaced.  The German guy said the 5000 turbo was junk basically, Am I fighting a lost cause you think?  If anyone has some ideas please let me know.  Thanks Jim