My cat is having serious misfire issues at cold start under acceleration. Symptoms lessen as car reaches operating temp. If i drive the car for 30 minutes, park it and turn off let sit for 30 minutes restart and drive no more symptoms til the next cold start. No codes whatsoever, had it into jaguar $ 800.00 later same problem, they replaced mass air flow sensers/ help please and thank you in advance for your input.

 

I would try running the codes using a cheap OBD bluetooth dongle, report back, and go from there.

 

I had similar issues that jaguar couldn't figure out.

Check the vacuum hose on the supercharger actuator near the throttle body. Mine was cracked and brittle. As mentioned above, check your codes. Auto zone will do it for free, but you can buy a quality obd2 reader for $70 or a cheap Bluetooth that works as well for $20 on eBay. Get the Bluetooth that turn off automatically to avoid battery drain when you leave it in. It's helpful, bc you can read codes and data as you drive via your phone.

I was getting a misfire on 2,4,6 and the issue was a bad coil. i replaced all 3 sourced from eBay for $70 each.

Check the hose and the codes before replacing parts.

 

The only code the car showed was p0193 fuel rail pressure sensor a circuit high input

 

There is another post about that code and location