The car stops intermittent during driving (not pleasent at all!) and does not start (ignite) again before after 5-20 minutes pause. Start motor always runs ok, but there is no sign whatsoever of ignition when the fault is present. NOTE: The glow lamp lights only weak when the problem is present. When full light intensity on the glow lamp returns (normally after waiting for 5-20 minutes)- then the engine starts easily and runs ok, but will stop again after may be 15-30 minutes driving. The things repeat. Anyone got an idea what to do?