Continues to stop & restart but keeps stopping.

Whats wrongf with question

How do I secure or if need new one, how do I install and secure to block.

my 92 Saab 900S failed low idle emissions w 239 of 220 ppm but passed high idle w 94 of 220 ppm. what would cause this problem and where would i start in terms of correcting this problem (repairs)

I understand that the top can be lowered and raised manually.. where is the motor and valve located?