2001 Chevy Impala

The starter turns but dont engage the flywheel.

Do you mean you can hear the starter engaged the engine but its not cranking over or it won't crank engine over at all-nothing happens when you turn key to start position? The new starter overrunning clutch could be slipping

You're too far from the flexplate-try using shims. You sure you got the correct starter-double check

Check the ABS/PCM fuse 10amp and crank relay then get back

Test the fusible link blue 18 gauge that's coming from the remote battery stud. This checked out its gonna come down between the ignition switch and computer.

Hold key at start position and check computer control of relay purple wire whether it has power see below

Test the purple wire for power going to the computer see above circuit

The computer is in the aircleaner box