there are a couple of gaskets that you should replace. there are the front and rear of the intake manifold, then there are 4 inside the intake manifold. also the o-rings to the MAF, the ASC throttle (if applicable), the air filter box, and the ICV. if any of them down wind from the MAF have a leak, it will cause a problem. they can crack from age, and when the temp in that area gets hot they expand and seal up better. also replace the air intake temp sensor.
Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue