[JustSayGo]

Yes your TPS being out of adjustment will effect the idle. Do you have the big vacuum hose to the brake booster connected to the intake manifold?

The computer gathers information from the sensors that indicate engine load, ambient temperature, engine temp, throttle position, unburned fuel, fuel knock, road speed, engine RPM, and intake air flow. With the input of info the computer determines the best signals to send to actuators like Idle air control and how long the fuel injectors atomize a spray of fuel. The computer also determines and sends the spark signal to the coil at the best time based on the constant collection of information.

You are exactly right about the necessity of the sweeping arc contact on rotors or wider contacts in distributor caps. Over 15 years ago the most sophisticated Electronic Engine Control systems (in Sweden) were capable of signalling different spark timing and fuel delivery to each individual cylinder and change the individual signals for each consecitive four stroke series. ECC systems continue to do more and more each year, adjusting cam timing and duration profile as well as working with electronic automatic transmission computers.