when i bought my5.0 the guy told me it had an aftermarket cam in it...he gave me all the reciepts for everything i mean everything...but not one for a cam..it idles rough like the FMS E303. i dont know if its stock or aftermarket. help me out please. here are my mods and times..
4.10's, mac headers o/r hpipe
FMS HD t5 trans, pro 5.0 shifter, FMS HD clutch
under drive pullies
K&n
MSD BLaster coil
Alum drive shaft
timing at 14degrees
BEst ET= 15.1 @91 mph
2.1 60'
Remember im in colorado at 5000'+ Above sea level
thanks
could it be a faulty Idle Air Control(IAC) motor that causes the rough idle?

 

the cam should have some markings on it, but you would have to take it out for that

 

hello