Hard starting '90 200TQ (10v)

[Eyvind Spangen]

The '90 200TQ has been acting up lately. After I got the injectors
changed, a strange problem has occured. If I leave the car for one or
two days, it will start up immediately and run smooth, but if I leave
the car for a week or more, it will fire up, but run rough and stall
in a few seconds, I have to crank it a few times to make it run at 
all.. The problem seems to be temperature independent.

What could be causing this? Fuel pump & fuel accumulator was changed 6
months ago, and I didn't have this problem before the injectors got
changed..

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Regards,
ES