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Intermittent no start 700

My 1990 740 (rex/regina) has intermittent starting problems. Once it starts for the day, then there is no problem. When it sits over night, it is often difficult starting the next day. It cranks fine and catches for a second or so, but then just cranks some more. It gets spark (not too strong). It has a good battery, rotor, cap, plugs, and wires are all fairly new and good quality (bosch and bourgicord).

It has always started eventually, but does seem to be getting worse. Fuel relay is good and I swapped interference relay with the one that is next to it and it did not help. I disconnected air temp sensor and it still ran and started. Any ideas?

Thanks






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