hard brake pedal but only for 20 minutes
Car is a 1995 Ford Contour 2.0l
In the morning my brakes act like there is no vacuum at all - the pedal is rock hard. It also idles very roughly and stalls at first.
Then after 20 minutes or so the brakes are normal and the idling is better (though still a little rough). I have searched for vacuum leaks extensively, have replaced the egr, iac, and pcv valves, replaced plugs, wires, air filter, and cleaned maf.
The problem is worst on cold days, which makes me wonder if heat helps some rubber based vac leaks sort of seal up. No idea though.