V6 or 4 Cyl.? Intake leaks will cause some of the stalling you mentioned. Replacement tubing shouldn't be that expensive from the dealer. Until then use more/better tape or put on an aftermarket intake. IIRC pipe into main cat is like 2 1/2" but only 2" out the back for stock pipes. The stock flex pipe just before the main cat iirc, is a little over 2" ID.
