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if a loose or leaking gas cap was the problem, go to a dealer and request the code to be cleared. it may cost a few bucks.
you're climate control module is bad (located behind the glove box and accessed by removing the under dash kick panel on the passenger side. Visually it has a group of colored vacuum hoses all connecting to one area of a black box. It operates with the assistance of vacuum from the motor and you'll most probably need a new vacuum hose assembly with the module. Have a professional diagnose it and replace it. It's sort of a headache to do.
if it is coolant leaking out the heater core, the fluid will have a very slippery feeling when rubbed between your fingers. If it isn't slippery and instead feels like water it's due to a clogged drain that allows condensation from the A/C evaporator to escape through the firewall. Best to let a professional diagnose.
fuel pump....in fuel tank fuel filter....follow the fuel pipes from the fuel tank You'll find it!
Contact a Toyota parts department and find out.
It's old, it's used, could be anything.
sounds like an ignition problem.
look in the owners manual for the location of the relay and fuse boxes. Usually they have the relays identified on the cover or by the relays themselves or contact the parts department of an Audi dealership and make inquiry.
you might have to replace the selector plate assembly. Call a dealership parts department to find out if their are bulbs for the selector plate.
engine sounds without hearing them personally are impossible to diagnose this way. Possibly a bad rocker that opens one of the valves???