RPM Drop!!

Who told you the alternator was bad? Have you had the battery tested? How did that person come to that solution?



It sounds like a faulty IAC would be a more likely culprit or perhaps a vacuum leak(s), IMHO.


Also, what mods do you have ?

Performed any recent work under the hood, especially along the air intake tract (air filter, upper intake piping, etc)? Perhaps a recent mod or work under the hood has caused this drivability issue...

I bought my 01 cobra in Dec and had the same issues after doing my diablo predator tune to fix my gear change. So its when you come to a stop after the car is warm I'm sure it drops and you have to rev it or let it fall on its face. Well I was getting pissed with this and it made me not want to drive it. So long story short I replaced the IAC and it helped catch the drops alittle bit but, not fixed. So I updated the software on my predator and it is completely fixed. From what I've heard if you have a cold air intake the rush of air in the intake causes this and the IAC is stressed with the job of keeping idle. I also cleaned the Mass air sensor and that helped. So I would just recommend a tune and that should fix it.