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86 535i (E28) Running Rough



I have an '86 535i that started running rough after the
battery was disconnected and then reconnected again.
This has happened to me twice in the past 2 months.

The first time I removed the battery to try it in a friends
E28 that had a dead battery.
After I put it back in my car, It ran very roughly when I
started it and I had to keep my foot on the gas to keep it
running.  After a few minutes of this it smoothed out and
ran fine.

Last week I disconnected the battery so I could remove the
instrument cluster to replace the service indicator batteries.  When I reconnected the battery and started the
car it ran very rough and I had to keep my foot on the gas to keep it running.  It runs rough at idle and at higher rpms and it still runs bad after it warms up.

I checked for vacuum leaks, I checked all of the electrical
grounding and I checked the idle control valve and found no
problems.  Does anyone have an idea what this could be?

Thanks,

Terry Peterson

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