I replaced the wires one at a time . My indication is only on the tach inside car appears to run ok.

changed wires and plugs and now i have an erratic rpm indication ?

Ihave read this before volvos are hard to troubleshoot and i am an aircraft mechanic with 40 years of experience. This car will start and idle but on accel. will not go above 2K rpm for a while than it jumps past 2K and shifts and runs fine. down shift below 2K starts all over again. it does not car...