Sounds to me like a plugged fuel filter. Had a 72 Riviera once with the identical symtoms. The filter in the tank was the problem. Ken Quoting Jim Blair <carnuck@xxxxxxxxxxx>: > A: Choke partially closed? Knock sensor making the timing stay retarded? > > > From: Marty Bricker <mbrickerusn@xxxxxxxxx> > Subject: 83 258 engine problem > To: northtexasamc@xxxxxxxxxxxxxxx, AMC List <mail@xxxxxxxxxxxx> > > Took my daughters 83 Spirit out for a drive to see if > everything was running ok. Engine started, idled, > accelerated normally and ran fine up until I hit 55 > mph. It was like a governor or something is on the > engine, it just won't go any faster. It feels like it > will stall or backfire if I try to continue depressing > the accelerator. I got it up to about 58 mph but it > was starting to bog down so I backed off to 55 and it > ran just fine. I haven't checked the timing yet, but > anyone have any suggestions? (83 Spirit, 258, BBD > carb that was rebuilt a little over a year ago. All > pollution gear is present, and, to the best of my > knowledge functioning. Plugs, wires, coil, o2 sensor > replaced at same time as carb rebuilt. It has the > Ford upgrade of coil and bigger cap). Thanks. > > Marty > > > >