Perplexed? Any Help?
 

Problem: Every morning when I start my car (garaged) the car starts fine, but I have to wait until the temp reaches 130-150 before I can drive it. Why? Well if I try to jump in and wait even 5 min it will back fire when I acc, rpms jump, and it acts like its running on 2 cyl (and diesel). This is what has been done so:
NEW WARM UP REGULATOR
FUEL MIX CHECK (via “professionals”)
COLD MIXTURE ADJUSTMENT (via same professionals”)
NO AIR LEAKS
POP OFF VALVE INSTALLED

Not sure what to try next all I can say is the “professionals” I took my car to billed me $300 for a rear end alignment and…………Oh yea to fix the cold start problem.
Car is a 1975 911 CIS
Any Help Here
Thanks

You are reminding me why I hate CIS...

You might check the fuel pressure -- could be you need a new pump.

Be sure the pop off isn't leaking (tho why it would do that only when cold is anyone's guess).

Is yours too old to have an AAR?

Essentially, you need to check or replace every other pieces of the CIS... start with cold running only items...

Yea New Pump no AAR
and yes I am putting together an EFI system also.....

OK, then how about an AAV... just go down the list of acronyms and replace each one -- that's how to troubleshoot the CIS.

And each step 'only' costs a few hundred each.

Or... John W. or somebody might be able to isolate the problem right away....