Starts but doesn't run...

[CVJR]

Thanks in advance for taking a look at my question. My '87 930 will start, idle very low and not throttle up/ makes no power/ feels like not getting enough fuel' running on 3 cylinders. Weird thing is, if I let it sit for 10-15 minutes it will start right up and run smoothly, make good power, etc. This happens when it sits for more than a day. The other observation: When it starts the 2nd time, it runs at a higher idle like cold start, then a couple minutes later back to normal idle. Temp here in MD has been 80-90 degrees when this occurs. What is going on here, didn't see anything like this in the Sticky on starting problems.

[T77911S]

always make sure the basics are taken care of. plugs, cap rotor, good wires and no air leaks.
then i would make sure both pumps are working, check fuel pressures

[CVJR]

Thanks T77. Basics are in good order. New plugs, wires, cap rotor, valves, etc last Sept/ 1,000 mile ago. Checked for vacuum leaks. Last thing I did prior to that was install Leaske Adj WUR about 18 months ago. Baffling to me that it starts fine 15 minutes after the starts but won't run at first.

[T77911S]

makes me think fuel pressures

[smurfbus]

Wur pressures or CO a bit out out of spec