82 SC Starting problem

2 years ago, my 82 SC quit starting when cold. Actually, it would start normally sometimes but more often it would spin, occasionally try to catch. Eventually it would start, racing and stumbling, unwilling to take fuel from the throttle. Once the engine warmed a bit, the engine would level out and would behave normally, albeit with a higher than normal idle.

SInce then, I have replaced the cold start valve and the warm up regulator. Sometimes it starts fine, I went through a week where it behaved perfectly and then refused to start for another two weeks. I am suspecting the ECU, when the car is unwilling to run after a very hard start, disconnecting the ECU makes no difference in throttle response or rpm. I'm thinking the hardware on the engine is good but not getting the right signals from the ECU. This is extremely frustrating, I turned it over to a mechanic who drives Porsches himself and he gave up after a month. ANy help out there?

Thanks to anyone who can, Darwin