[TR] Rough running engine

[Cosmo Kramer]

Hi List!
How important is proper backpressure on the TRIUMPH engine running?  
Not on the body of a person.
 
My car is running rough, & I've all ready
replaced the Battery (over 10Yr. old), & the coil with another that helped the
car run better It's not new & I don't know how good it is because I was told
that there is NO WAY it can be bench tested. Is this a true statement?

-Cosmo
Kramer