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Hard cold start, bad missing on cold mornings-- B280F 700 1989

Hello all:

The weather has cooled down considerably over the last few weeks and my 760GLE with a B280F doesn't seem to like it much at first:

On the first cold start of the day, I have to crank longer than normal to get the motor to catch, and when it does, it runs very roughly-- only on a few cylinders. Eventually each of the cylinders starts to fire. Once it is firing on all cylinders it runs great. This happens long before the motor is warm, so all the sensors are probably out of the picture, right?

Can anyone suggest possible causes for this problem?

Thanks!

Herb Goltz, London, ON, Canada, '89 760GLE w/169K mi






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