MIGHT SOLVED THE PROBLEM.
Well Ive been having some problems out of the Cobra rough idling and missing through the rpm range. Well me and Ryan (Mugenteggy) was trying to troubleshoot the problem so we decided to check the o2 sensors. Well lol the passenger side rear one we took out was well gone. The whole end of it was broken off. Dont know if this will cause the problem but I will find out. Now if any of you Mustang fellas have one to sell kinda cheap I dont feel like spending alot for one but if anyone has one that I could buy let me know. Thanks Larry

The rear o2 sensors are for emissions only. It shouldn't affect your drivability in the least bit. Maybe you have a coil pack going out.

Rear o2's are only for monitoring what the cats are doing. I would try the coils are fuel injectors check the maf. There is no codes being thrown? Also it could a leak after the maf or a vacuum leak?

Well there are no cats and there has been codes for bank 1 sensor.

Ok you guys are talkin about the Mass Air Flow sensor, well I unplugged it at idle and it didnt change the idle just went a smiggin higher actually sounded better, well I drove it and it didnt change it at all. It didnt help or hurt, whats that mean?

Probably means it could use a good cleaing :lol:

Well cleaning the MAF didnt work and I checked the IMRC's and they are opening fully at 3500 RPM....so I guess im goin to replace that broken o2 sensor. I went to Brother's Mustang and they said that all four o2's are linked together some way and will cause the problem that i have. Its been doin it awhile besides the o2 have never been changed Im goin to now expecially after one is completly broke off and deteriated.