Slow starting when cold

[Richard McGowen]

I have a 2001 Z06 that when the engine is cold it struggles to start. The engine cranks for a short period of time then sort of stumbles before runing smooth. When the engine is warm it starts fine. Has anyone else experinced this?

 

[c4c5specialist]

Hi there,
There have been numerous issues with fuel formulations in c5, and other cars. I would suspect that there may be a revised program for the PCM.
With the fuels today, its a miracle that we can get the power that we do today.
I would suggest that you check to see if there is an updated program first, before tearing into anything further.
Besttoyou, c4c5