What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
1998 1.4 Engine tick-over - TweedleDee
When the engine is warm the tickover speed is not constant it seems to vary all the time
1998 1.4 Engine tick-over - Screwloose

A split breather hose, leaking inlet gasket, or a sticking idle speed control valve are some of the possibilities.
1998 1.4 Engine tick-over - bikerider
Very likely the c/case breather causing the problem.Squeeze one of the breather hoses with a pair of pliers and the idle settles down it is very likely to be the breather.