I have had a problem with a rough idle. I was throwing 4 codes and then replaced the MAF and all but 1131 went away. Recently my 1996 4 cyl. auto. Countour Gl has been bogging down at various speeds w/ flashing CEL. It also shakes badly at the stop lights in drive only (suspect Trans. Mount for this one) I have visually checked the vacuum hoses(good), I also checked the EGR valve with a hand vacuum (good) Something tells me it is not the IAC but I am not sure, If anyone can help me please reply!