1993 Cadillac Deville ignition

Codes 52 and 53 are tps out of wack, the throttle plates need cleand and tps adjusted to.5 volts with ISC motor fully retracted

have you tried squirting carb cleaner down the throttle to see if it would start?

I think code 12 is cam reference signal, if it doesnt start with carb cleaner then replace cam sensor and pick up coil, remove the distributor to do this

Code 12 replace the hall effect switch it in the distributor (cam sensor) remove the distributor to do this, replace the pick up coil also

the ISC motor works off the TPS if you dont set it right it throws off the ISC motor

after the dist stuff is done, do the TPS adjment, clean the throttle plates with carb cleaner there probally black with soot, the throttle plate has to be clean, raise the idle to above 1500 rpms to disingage the ISC motor, use your finger to push it down, and then disconnect it, does the car idle normaly, if it doesnt then adjust the idle to 500 rpms. Back prob the TPS for its voltage signal its.5 volts no more no less. Shut the motor off and then reconnect the ISC motor. Let the car warm up a little, it may Idle a little high, this is normal, a Idle relearn must be preformed. Shut the car off and wait a sec and then cycle the key 3 times( on, off, on, off, on, off ) turn everything off AC and heater, and start the car, let it idle for 3 min without anything on, after 3 min turn the AC on let idle 3 min, after that drop it into gear and wait 5 min, shut the car off and then test drive it, if it still Idles high do it again