I was climbing a steep hill on Saturday when the vacuum hose popped off. Since then, any time I accellerate, the vacuum hose pops off.
I was thinking that the only thing that might cause this is excessive exhaust back pressure. That made me think perhaps a plugged catalytic converter. - Well, this car has two catalytic converters and there seems to be unrestricted exhaust flow at the tailpipe (I have no way to test the pressure, but there seems to be ample flow of exhaust coming from the pipe)
The car seems to have enough power, but the exhaust flowing out of that little metal tube is quite loud. Further, the only problem with the cars performance I've noticed so far is an inability to adjust to normal idle when comi8ng to a stop. It bounces back and forth from 500 to about 1000 RPM two or three times when I come to a stop.
Could there be any other cause than plugged catalytic converters?