G`day from down under, i seem to have a problem where the car has no power for about the first 30seconds after starting cold or after sitting for an hour or so when hot, has a bit of a hesitation initially too, sometimes not allways starting in the first crank, but allways the second, but runs perfect after about 30sec or so....cat is a bit rattly too...??? any idea? position sensor? pump? relay?
Thanks all.

I would think if your problem is only ever in the first minute of running, that it would be fuel related; any electrical intermittent would likely be less predictable. Since a higher percentage of fuel is required on startup, and the 1986 has no cold start injector, I would think that:
a) your Engine Coolant Temperature sensor is not informing the ECU that the temperature conditions require more fuel; or
b) you have a vacuum leak after the AMM, so the mixture is lean, which is more of an issue when the engine is colder, and needs the richer mixture most.

Verifying the ECT is best done right at the ECU in the passenger side panel, where you can verify its wiring also. You can:
1) verify the temperature/resistance relationship. This can only be done if the connector is pulled. Bentley has a graph, or there's a chart at http://www.brickboard.com/FAQ/700-900/EngineSensors.htm#EngineTemperatureSensors
2) or you can read voltage while connected (see same page in FAQ).

For vacuum leaks, I think the best suggestion I've seen is to use a propane torch (un-lit) at a very low setting, with a rubber tube connected to it to introduce extra fuel to expected vacuum leak points. Block the fan air from disturbing the test, and see if seeping this extra fuel at various points (along air intake path, past AMM; injector seals, etc.) causes the engine idle to increase. If so, you've found a vacuum leak.

I have an 87 with what sounds like a very similar problem, and have not been able to solve it, I would appreciate it if you would let me know if you figure something out!
Thanks, Mark
Yodermark@hotmail.com

the car does not have a position sensor. the dist has that job. maybe the pickup or the harness as it passes under the engine is breaking up. could be an old fuel pump getting tired while it's getting hot. fuel pressure and volume test would be nice. i also wonder what kind of shape the harness at the amm is. check the timing advance, if it doesn't advance, that'll keep power down. maybe the ignition brain or it's connector and/or harness, again, under the engine. good luck, chuck.