Bruce,
Thanks for responding. It's a dual sync distributor. I have to do some bus work tomorrow, safety for the kids, so won't get to look at the MH setup. All plug wires by Accel. Has the stock Cadillac iron manifold drilled for 8 injectors. Sequential. Each injector can be modified with respect to duty cycle. Will check on the numbers but I think hardware is about 2003 or so, and software has been updated. Accel coil mounted under front seat in inside of motorhome, along with the computer, flopping around in there, not mounted. It tells me that perhaps the previous owner was trying to get it to run correctly and never buttoned things up because it was never to his satisfaction. I don't think he has mounted a knock sensor.
Now thinking about engine issues. I just got back the oil analysis. Blackstone says no apparent problem with oil overheating despite the absence of oil cooler, viscosity was not bad at all. However, there is evidence of iron, copper, lead in the oil pointing to crankshaft bearing issues. Now, after changing the oil and filling the filter 2/3 full of new oil, there was about five seconds with no oil pressure, after which it came right up. During that time, there was no main bearing or rod knock I could hear at all. (I remember previous engines with loose or bad bearings were noisy during that time.) Used Rotella 5w40 synthetic for the fill. Interestingly, the lower oil pressure at idle with the slight noise is gone with the new oil. Older oil (PO says Mobil 1 but didn't state the viscosity.) was only 2000 miles old, but I wanted to see about the analysis. Puzzling to me. Got the noise at ldle at 23 lb pressure when hot. Now, with new oil, the hot idle pressure is more like 35, with no noise. Hot cruise pressure is now 50 lb like when I picked up the MH, but after some hours of hot weather driving, it went to 43 and deteriorated slightly from there. Coolant temperature stayed at 180 most of the time, always caught it before it got to 200 and got my foot back out of it. It ran so well at speed that it was hard to go the speed limit. It's a willing runner at cruise, anything off idle, throttle response is fine. Problem only with cold start, stumble coming off idle. Mechanical oil pressure gauge, VDO. The magnetic oil plug had only one whisker of metal filings on it when changing the oil that I could see. It might be completely all right, but the lowering oil pressure cured by an oil change is puzzling to me. No other issues reported by Blackstone, they want another sample at 2000 miles additional. I will probably do it.
Idle is still not smooth, this is a Cadillac, after all. Not a smooth idle. It had the torque cam, which I think means it should idle fine.
More later, it's been a busy week at work. I will try to get ACCEL numbers if I'm not fully tuckered out tomorrow afternoon.
I understand what you mean about cutoff of fuel during deceleration. I didn't think that through. Thanks.
Carey