I have a 1st Gen, but thought I'd post it here as well since the garage where I take my car is scratching their heads on this...
I have a 1.8 OHC in my 1985 Skyhawk.
When driving along, usually when the tach gets to around 3K (60MPH on highway, maybe 45MPH uphill) the car starts to seem as if it has a total loss of power and then has power again, backfiring out the exhaust. This happens mostly when there is an electrical load being used (CD player, wipers, lights, heater--the more the better).
This year I replaced the cap/rotor/plugs/wires/ignition module. When this happened I had the coil pick-up replaced, and the fuel filter replaced. The car still does it.