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FI rough idle



Hi everybody. 
I have a weird problem with my FI:
- the engine starts up immediately, even after one night rest;
- however, it idles rough; I finally learnt that of the of the cylinders
  does not work at all (random, sometimes #4, sometimes #2, sometimes...),
  even though they all would work properly at higher rpm;
- also, at idle, if I let to much air by adjusting the screw on the 
  air intake case, I got only #3 and #4 running!

I suspected that the injectors clogged. I poured an aditive in the gas
tank. No change. Fuel pressure is 2.1 bars.
I mounted brand new injectors ( BOSCH 0 280 150 105). No change.
I re-re-rechecked the wiring, suspecting some bad grounds. All was OK.
Throttle switch and pressure sensor OK too.

I verified the compression. With cold engine, I got some nice values, in
the range 8.5-9.5 bar, 'cause 3 weeks ago I mounted new german rings
(Schotle Motorenteile) and grinded the valves and the seats).

Finally, I ran out of ideas. 

Could anyone provide me with a piece of advice? I don't realy want to
install carbies (SOLEX 32 PDSIT 2/3)... 
 
Bogdan KUCINSCHI
'71 Squareback



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