I have a 1994 Si and the rpm started bouncing....continued till the car began to misfire and catalytiv converter got cherry red....a leak was found in the manifold and the washer replaced 1/10/06....that fixed the bouncing etc. Just driving in this morning 1/18/2006..it started missing and backfiring again, catalytic converter cherry red again.....whats going on, anyone else ever had this problem? Car is also overheating on standing still.