My mustang is 347 stroker with trick flow heads, 30 lbs inj. with matching Pro M. I did not do any of the on this car but i am handy with EFI foxbodies. I went through the receipts and prev owner had the car dyno tune by Dan Millen at Livernois before doing all the changes to the car. The stroker n full motor change. I am thinking about maybe doing a mail in re tune if quotes get too expensive or keep it the way it is. The whole purpose was to get better driveablity for cruising the car runs a tide bit rich. The car was tuned for open loop to get away from O2 sensors prior to the all the upgrades, the car currently has new O2's wonder if that could be why it is running rich. also the car does not have a PCV valve I tried to install one and opened a whole new can of worms. Car is making a horriable loud squealing even squeals after the motor stops running. Do you think I could get any from running a PCV system and just run two breathers in valve covers.