I had a clutch squeak about 2 wks ago for about three days and went away by itself, it would squeak with no foot on pedal, but when stepping on pedal, noise would stop; i did the clutch pedal mod over 20k miles ago with no problems after; also, cel came on last week for three days and went away yesterday, today came back on, im worried, truck has 34587 miles (still under basic warranty). I scanned it, and code mentioned above came on screen (catalyst efficiency below threshold, bank 2); im gonna scan it again to see what comes on; any thoughts????