The S16 has had rough running problems for quite some time now. When idling, there seems to be a miss or a slight drop that happens every 5-10 seconds or so. I have a supersprint muffler and it is very audible from the exhaust note. When under harder acceleration the car doesn't PULL smoothly like it did when i first purchased it. It seems to hesitate a little, (its very hard to describe). I replaced the oxygen sensor and spark plugs the other day and for a day it accellerated very well, however the uneven running at idle was still present. So I have just finished replacing all the coil packs. However the problem is still occuring!
Any thoughs would be greatly appreciated! Its driving me nuts and im no longer liking my s16.