Replaced starter and now the engine runs very poor

[Jules12345]

Help pleeeease,
I don't know what I've done, but since I replaced the starter motor, I drove the car up the road and it started sounding like it was running out of petrol (it wasn't). When it idles and I accelerate, the engine sounds 'tappity'. I must have done something when I removed and put back the Manifold and throttle body, but I was super careful. Any help very welcome. Thanks in advance.
Jules
Boxster 2.7 2008

[tcora]

Jules - you know what the problem is. Start taking stuff off and keep going until you find what you either reinstalled incorrectly, or didn’t completely reinstall.

[jluetjen]

Did you by chance touch the butterfly in the throttle body?

I've heard a lot about how the fly-by-wire butterflies do not respond well to being moved by hand. I suspect that it somehow throws off the calibration.