Hello. I apologize if this question has been asked before. I have a 96 roadmaster that runs super smooth, starts first try and hums along nicely. I do get a random problem however. Only when climbing a hill, the car throws a misfire code. Sometimes it is cylinder 5, sometimes it is multiples. There is no noticeable loss of power, the only symptom is stinky exhaust and it is typically pretty brief.

I have changed the fuel pump about 15k miles ago. Most receintly i changed the wires and plugs (good quality, but i dont remember the brand), changed the optispark (Summit racing brand), changed the coil and ignition control module. But I'm still experiencing this occasional problem.

My last guess is injectors or pressure regulator. Has anyone else experienced this problem, if so how did you resolve?

 

The stock injectors do have problems. Are they high mileage?

 

I got the car 4 years back and everything seems to have been original. I haven't popped the injectors out yet, but I would bet they are original at 180k miles.

 

Might at least get the injectors checked out. Or buy rebuilt Bosch 3 injectors I put at set of these in my LT1. https://fuelinjectorconnection.com/c...3-injector-set