Bought a 1995 diahatsu charade. drives fine except after it has been driven for a short time, it will idle rough and can stall. after it stalls it can be difficult to restart. Starts perfect each morning in cold weather or warm weather. issue only appears after i have driven it for about 15-20minutes and only when idle, at a set of lights or coming to a stop. Car has a manual 5 speed gear box.

recently changed the thermostate as it was running a bit hot. Temperture has stablized since then.