WillinHiFi
New Member
- Joined
- Aug 19, 2016
- Messages
- 4
- Reaction score
- 0
- Points
- 0
- Location
- White Lake Michigan
- Vehicle Year
- 1989
- Make / Model
- Ford
- Transmission
- Manual
My 1989 Bronco ii 5Speed will jump up to 3000rpm when i shift gears and it will stay that high until you go under 25mph. Then it will return to 1000rpm idle. I have a KOEO code of 41 which is O2 stuck lean. Ive found one vacuum leak were the plenum meets the lower intake. I was able to get the rpm to raise with propane around the front two intake runners. i cant get it to do it again and im at a loss.