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I believe that you have two separate issues;
1 - As stated above, drive the car in varying conditions for 20-40 miles to let the ECU recalibrate the engine to the new MAF. Start and stop the car a few times when cold and when warm as you're driving around. Clearly, when the car is cold, the mix is wrong and the engine stumbles and barely runs. Once it warms up and the computer transitions to the warm running program everything is ok.
2 - I agree that your starter is likely on the way to failing. That is what is making the weird noise at startup.
Hope this helps, best I can do from a video!
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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