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The 505 is likely the result of the 365. The camshaft position sensor is needed to help determine what idle should be. Most likely the sensor is worn out (oil gets past the seal inside and shorts out the electrical components) and needs to be replaced. Clear codes after replacement before driving.
With all due respect to the fine folks at DEQ, most of them are not automotive technicians (they would be working for dealerships or have their own business if they were). They simply may not have been able to properly plug in their scanner to the port located under your dash. (BTW, if your computer were not powered, your Jimmy would be running like c**p, if at all) So I highly doubt that the computer isn't working. Who looked at the problem after DEQ? If the person was a mechanic or automotive technician, he or she should have been able to diagnose and fix the problem. Try taking the Jimmy to a larger auto parts store and ask them to read your computer for error codes. If they find any, they can tell you what the code(s) are and interpret them for you. If they can't get their code scanner to connect properly, you may have to take the vehicle to a qualified auto electrical/electronic technician who should be able to trace the port's wiring and determine why scanners can't connect properly. Good luck.
You may have a EGR valve plugged exhaust gas passage, so when it is opened the systems computer doesn't see any change in the O2 signal voltage. To check this manually pull open the EGR valve, the engine should run very rough and will stall out most times, if you open the valve up and see no change in the engine idle the passages are plugged with carbon and must be cleaned. As long as you have this EGR problem the car will not pass smog.
For 83-86 Camry, 87 corolla, 84-87 pickups and 4-runner: Code 12 = knock sensor or circuit (distributor or circuit on Cressida, Supra, and Celica 3S-GE)
87-90 Camry, all other models 88-90: Code 12 = Rpm signal/no NE or G signal to ECU within several seconds after engine is cranked.
All models from 1991 on: Code 12 = Rpm signal No "Ne" signal to the ECM within several seconds after the engine is cranked. No "G" signal to the ECM two times in Succession when engine speed is between 500 rpm and 4000 rpm.
first is up you octane with an adative or tank of has. the next would be to inspect your rotor cap for crac ks/ scale build up. if showing a lot of build up on the contacts replace cap and rotor button. Those ate the easiest and cheapest improvements. the octane boost reduces the misfire due to detonation