[pmead]

Need some help. I have a 83' SC with a fresh rebuilt engine with new injectors new vacuum lines etc. The car has run perfect for the past 2 months since rebuild. Now that the temps have dropped to below 70 I have an annoying cold start issue. On the initial cold start the car will rev to 14-1500 and then drop rpms and either stall or slowly surge back up then down. Throttle has no effect during this time. When I restart car it runs up to 15-1600 and then gradually drops down to 950 and acts normal. The problem is only on the first attempt. The car has a new WUR and I checked the fuel pressures.
System 4.7 bar
control 1.8 @ 20c
warm control 2.4 @ 1min
3.4 @2min
3.5 @3min
3.5 @4min
Residual 1.8 after 10 min
The numbers don't seem bad to me. Control pressure may be a little low, but it is close to spec. Mixture issue? (seems lean during issue) I do not have a CO meter.