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A blinken lite means the cat converter is bad. Unplug the computer n clean the pins then replug. Connections on old cars often get dirty. Get a datastream run at a privateshop to target issue.Its better then a code reader. Wiring harness should be inspected for flaws
One injector (#2) is not working properly causing misfires. This can be because the injector has failed, the ignition control model driver for that injector has failed, or there is a wiring problem between the module and the injector. Most frequently, it's the injector and you could start by replacing it, but it's complicated and if it were me, I'd take it to a GM dealer for diagnosis and repair.
Welcome to the Cadillac world. These are the second worst to work on when it comes to computers/wiring. Mercedes are the worst. Diagnostic time at my house is $300(tells you what is wrong). I refuse to do them at work, they don't charge enough and I get yelled at for taking to much time. Just take it to a dealer.
Temp is going up, well that doesn't mean anything unless it actually overheats, in traffic it can reach 240 F and present no danger of engine damage. If this is not the case DO NOT DRIVE THIS UNTIL THE PROBLEM IS FOUND AND REPAIRED UNLESS YOU WANT TO BUY ANOTHER ENGINE JOB.
YEP BAD FUEL PUMP WILL CAUSE STALLING AT LOW SPEED DRIVING ALSO OVER HEATING ENGINE,STUCK OPEN PCV OR EGR VALVE,FAULTY IDLE AIR SPEED CONTROL VALVE,FAULTY TORQUE CONVERTER CLUTCH SOLENOID.I WOULD HAVE CAR CODE SCAN FIRST BEFORE BUYING A $500.00 FUEL PUMP.
serpentine belts should be replaced when cracks are running across"v" portions of belt,when missing ribs 1/2 " or longer,or cracks running parallel to "v" portion of belt. the thermostat should be replaced if the car seems to take a long time to warm up or if the engine runs hot
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