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Justin Case Auto
If I remember correctly the '92 Cadillacs have the resistor pellet in the key. Because you already tried a different key the problem could be a broken wire from the ignition tumbler to the connector under the dash. Have someone test the resistance of the tumbler and replace if needed.
Get some throttle body cleaner (I don't like starter fluid) and spray a little in the throttle while cranking and see if the vehicle will start. If it starts check for fuel injector pulse. If it does not start check compression for possible timing chain issue.
Go to a shop and have you brakes inspected and rotors measured for warpage. Most likely is warped rotors but let a shop see if something caused it.
Have another shop take a quick look at it and get their opinion. If the second place thinks it's too low then nicely and politely take it back to the 1st shop and have them fix it.
Above answers are correct. In Florida make sure the radiator cap will hold proper amount of pressure, also make sure you have the 50/50 mix of coolant. I'm assuming this is a 3.0 U engine. These are known for the water pump impellers to wear away. Also make sure the 2 small hoses going to the expansion tank are not clogged.
Agree with above, check oil level first. Just remember... You have a gauge but the sender is actually a switch, just on and off. The gauge is either up or down on this vehicle it does not reflect actual pressure changes (why Ford did this I don't know). If the oil level is OK I would have the oil pressure tested by someone.
I agree with the above answer. You need to remember a new part is not made with precision. There is a good chance the new tie rods are a little longer or shorter. Get an alignment as soon as possible so you don't ruin your tires. If you have driven it a lot it may be in your best interest to rotate the tires also... after the alignment.
When installing new throttle body or ECM, the throttle position has to be learned by the ECM. To do this, turn Ignition On, Engine Off, for 30 seconds .
1st off there is a TSB #09-11-11 that relates to water getting into PCM connector. I would inspect that first. Disconnect the connector and if there is water in it dry it out and add some dielectric grease to it. Then will need to install the splash shield for the cowling vent. If the connector is not wet then I'm sorry I can not find information on if the system needs to be relearned or not or a procedure to do so.
Catalytic convertors can need replacement for a couple of reasons. They can loose the capacity to store oxygen which is its main function, it can plug up, or it can crack the inside and rattle. The main reasons for failure are coolant or oil being burned by the engine. Engine running rich on fuel due to bad O2 sensors or fuel pressure regulator among other reasons. Most of the time the crack inside by getting good and hot while driving and then driving thru a puddle and the thermal shock may crack the catalysts. When replacing convertors alway try to determine if something caused it.