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Bill,
My advice would be to borrow one, anyone who works on cars with points will have one lying around. It sounds like your car goes into closed loop when warm , but why guess ? My advice would be to first disconnect and unplug the gray vacuum retard hose at the back of the distributor and reset the hot idle to 950 rpm with the large thumb screw on the throttle body. This usually greatly improves start up issues. If you have gauges, check the pressures against the manual specs, but a CIS lambda car can have perfect pressures and run like crap. Check the ignition timing with both hoses plugged, 5 BTDC @ 950 rpm. Then drive the car for 10 miles and check the hot closed loop dwell.
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Paul
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