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My 86 was hard to start when hot, and it ended up stalling as well when it got hotter outside. Turned out to be the accumulator was allowing the fuel pressure to leak back to the tank through the small drain hose on the accumulator.
I tested the bad accumulator theory by blocking off the return so fuel could not return to the tank, and the car ran much better. For me, this was the easiest test since it did not require the purchase of a CIS fuel pressure gauge set (normal fuel pressure gauges don't work for CIS). Or maybe you can find someone to borrow the gauge set from.
I attached a drawing of how I plugged the accumulator and return hose temporarily. I don't recommend leaving the plug in place, it could eventually leak. Use high pressure fuel injection hose since it will be seeing 70-80psi I believe. I used a few pieces of aluminum rod that fit the hose inner diameter and clamped it with hose clamps.
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