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Another one:
awk '{p=$0; v=$2; getline; d=$2 - v} d > 100 || d < -100 {print p}' file

awk 'NR > 1 {
x = s - $2
if ((x > 0 ? x : -x) > 100)
print f, s
}
{
f = $1; s = $2
}' infile

And another one:
awk '($2-p)^2>10000 && s{print s}{s=$0;p=$2}' infile

awk 'NR % 2 != 0 {a=$1; b=$2} NR % 2 == 0 {if (b - $2 > 100 || $2 - b > 100){print a,b}}' inputfile

Or with awk:
awk 'c-->0;$0~s{if(b)for(c=b+1;c>1;c--)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}' b=3 a=5 s="abcd" file

Use nawk or /usr/xpg4/bin/awk on Solaris.