I have and 1996 P reg Vauxhall Astra 1.6 GLSi the rear end of the exhaust seems to make a weird puffing sound(hard to explain). This sound is not there when you first turn the car on and only starts up after a little while or if you rev the car, you can then hear it all the time.
When driving the car it feels lumpy and sometimes it feels like it's losing power and wants to cut out when the revs are low, but it still has plenty of power and is not mis-firing.
Two weeks ago a new EGR valve was fitting as this turned out to be faulty, was bring on the warning lamp, and was causing the car to mis-fire.
Does anyone know what the symtoms of a faulty exhaust are, i have to point out that the exhaust has been checked and doesn't have a hole in it, any help would be greatly appreciated.
Thanks in advance.