car idles great,,,can rev like mad ok,,,try to drive at 5-20mph,,,,car shakes so bad it gonna break my neck or the DIFF,,,ACELLERATING IS SUPER,,,at speed is ok,,,,new cap/rotor / pcv valve / Accel 8mm plug wires( seems like it got worse after putting them on), new plugs at 35-40,,,,pertronix system,,,flame thrower coil,,,ran ok/good till a few days ago,,,this is hurting the wallet if ya know what I mean ...try'd 2 DIFF.. carb'ds same model; moto 1100's,,,taped off pcv valve to check for diff,,no change,,,HELP!!!!


66 coupe 200 I6, 3 spd tranny

 

Sounds like a drive shaft problem, check your u-joints

 

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Yeah, the 1100's are famous for this. How about modding to a 2100 carb?