MC engine problems

[Eyvind Spangen]

Today, I helped a friend replacing injectors on his MC engine. The engine 
was idling rough, missing and sometimes not idling at all. Most of the time 
OK when driving.

We replaced the injectors, the old ones were really bad. The big problem 
now - the car now idles on 4 cylinders all the time, and otherwise behaves 
just as before when idling and slow driving. With higher engine speed (over 
2500 rpm), it runs fine most of the time, but sometimes missing and 
sputtering. The missing cylinder at idle is always #4, but there is fuel in 
the injector and spark on the spark plug.

It just looks like the injector replacement made things even worse than 
before. Plugs, cap, rotor and wires are new. Now we really don't know where 
to start. Any ideas?

-- 
E. Spangen