New car, new problems; 76 Duster 318

Ok

So I just got the car, and drove it across the city back to post. Noticed a few things:

1. A quite prominent vibration that comes up during acceleration (higher speeds, why I didn't notice it when test-driving), and goes away when you let off the gas...

U joints


2. Backfiring and chugging, seems like a cyl isn't firing right. Happens under heavier acceleration, but doesn't happen during normal acceleration. After the trip to post, I noticed this didn't go away. The sound was noticeable at the back by the tailpipe. Almost sounded like something in the exhaust was plugged? No noticeable noise under the hood. Sounded like a healthy V8 chugging away. When I got to the back of the car, though, it sounded like it had dual exhaust and one pipe had a potato stuck in it...

Plugs, cap, rotor, maybe wires. (plugs first if you want)


3. Speedometer doesn't work, starts at 80 and moves up with acceleration. Anyone know any sort of fix for this aside from chucking the speedo? Also, speedo gauge light doesn't work. Fuses? Temp gauge doesn't work. Light pullswitch knob is loose, pulls right off... Anyone got an extra light switch and temp gauge from a '76 Duster?

Probably going to have to get another speedo.
Track this stuff down (Chk bulbs etc) might just be the headlight switch.


Also, does anyone happen to have even an idiot book for this car? Hate not having one of those.


- CK