i have not considered the plugs, plug wires and dist cap since it runs smoothly at about 40mph and up. good point though. i will do that.

I have also read some posts on spraying carb cleaner over specific vacuum line to troubleshoot hard to see broken lines. Any comment on this method?

with the other recommendation, i found a local vendor for the injector cleaner BG 44K. Sounds like a lot of people are happy with this additive - although pricey at $17 a can. I will try this today.