My 2000 SLE has the series II 3.8L engine. I bought it w/31k miles 7 months ago. About 1200 miles ago it started to "stutter" only when I was slowly re-accelerating and the RPM'* were @ 1.5 (...yea...it took me a while to figure that out). When I gassed the RPM'* up over 2 - it would run fine. I started asking around - but the only advise I got was "can't figure anything out until the check engine light comes on". The mileage dropped a little (from 24 to 23mpg)- but that could have been due to using the AC (hot summer here!). Just checked it earlier this week (haven't had the AC on as much) and I was up to 25mpg
So fine.....it started running rougher and "missing" this past week (like all the time) and the dummy light finally came on. Computer said "2nd cyl misfire". I was advised that it could be three things
1) bad wire (there'* 43009 miles - logical to believe the wires are original.)
2) clogged fuel injector (put Lucas cleaner in about 3000 miles - but never fully serviced.)
3) intake gasket (lower or upper??) could be bad due to the Dexcool coolant eating it up.
So...I have my son (a Valvoline tech) who wants to check the wires and clean out the fuel injectors. I have a call into the local GM dealer to see if GM will cover this should it indeed be the intake gasket.
Oh yea. other changes I've made since I've owned it:
1) Oil - using that mobil synthetic oil
2) Gas - originally ran the cheap gas (87)...switched to the premium (93?) at about 35k miles...then downgraded to the mid-grade (89) at 41k miles. Why? Heard that the mid-range would produce just as good gas mileage as the premium...and that the premium could possibly clog the fuel injectors because it cleans "so well".
Any other ideas? suggests? good lawyers?
Sorry for not being too technical....being a chic, it'* the best I could come up with!