lol mine does that shit,cept that my speedo freaks out my ecy sparks and my check light blows. only if i get on it in 1st gear tho. or if i shift and the car jerks, i think its a loose wire somewhere shorting out.

as for yours, try the entire ignition and if that dont fix it. try fuel.

 

yea fuel was my next step. you know its weird when the cars running cold after its been sitting, and i try getting on it its breaks up real bad and the tach goes crazy bouncing everywhere, but once it warms up to operating temp, it does it a lil and the tach goes to normal. ive been able to fix every single thing on this car by myself, but this shit here is mine puzzling me.

 

not a bad gas problem then, it has to do with your dizzy or dizzy wiring.