The last week have had a new cold start issue. Turn key car starts right up will idle fine, give it any gas and it about dies let off returns to idle then stumbles then recovers. Can repeat until the car warms up 3-5min. Once the car warms up no issuses. Have no codes. Anyone else had this issue.
I have gone through the basics coil,plugs,wires,Throttle body,Bypass valve,vacumn leaks,purge valve,fuel pressure ect. to no avail.

It acts like a carburated car with no choke.

 

I just started having the same problem. Any ideas?

 

Our GP1772 has had similar issues. It, too, has a RMW tune and cam. That may be a contributing factor. We just start it and let it idle for a minute or two. It bucks and snorts a little but, once it warms up, it's a hoot! Any other theories?

 

Mine is bone stock and just started doing this two days ago.

Last fill up was out of state and tank was near empty. Maybe it is a fuel issue...

 

I filled the tank about a week after problem started. It's gone now.

Summer/winter blend issue? Maybe funny fuel at bottom of tank.