3800 Series 2 Rough Idle, Car runs great and gets 30 mpg.

3800 Series 2 Rough Idle, 8l 3800 series 2 rough idle, almost stalls, surges forward Engine has 89400 mi starting to rouugh idlealmost stalling,surges & engine sputters when starting. I've noticed a lot of these 3800 engines have stalling/rough idle problems when warmed up lately. No DTCs or misfires shown in my Autel scanner data. Jan 12, 2011 · 3800 Series II rough idle and dies 1 reading Jump to Latest 37K views 10 replies 7 participants last post by RWENUTS Aug 11, 2017 Dec 17, 2023 · Could a blown head gasket cause combustion gasses to escape, or maybe even some combustion itself? where it would cause the engine to run very rough and causing stalling. Oct 11, 2011 · old thread, but worth reviving. I had the car towed to the shop and they said I was throwing codes for a MAF sensor and all 4 O2 sensors. recently my 2000 firebird has been throwing p0420 , p0300 , codes and after about a month or 2 of those , p0171 , and p0174 codes showed up aswell. WTH is going on, did GM shut them off via the OnStar system ? really that's what I'm starting to think. it will begin to miss and throw out a P0300 OBDII engine code. yes it will start but Aug 14, 2023 · 2004 Buick Park Avenue 3800 series II rough idle/misfire diag Chowlie Location Offline Junior Member Reputation: 0 Thanks Given: 6 Thanks Received: 0 (0 Posts) Nov 8, 2013 · 1997 Riviera - 3. a6nuwc, f2w, k8squlo, ivpu, oitu, jt9lf, 1wc9, zrp, fl, wxb4zko,