Having a qualified repair shop do diagnostic's is probably what you should do , rather then replacing a bunch of parts that are not needed . Testing fuel pressure an flow , engine managment sensor input's to the PCM - engine computer . Do you know what a professional scanner is ? mass air flow sensor data , fuel trims ,short an long term , are the O2 sensor's switching normally ,
Sounds like a battery cable problem. Check the battery cable terminals for corrosion and tightness. If those are fine, have a load test done on the battery. Here is some troubleshooting tips:
Battery terminal connections loose of corroded. Check the cable terminals at the battery; tighten cable clamp and/or clean off corrosion as necessary. Battery discharged or faulty. It the cable ends are clean and tight on the battery posts, turn the key to the On position and switch on the headlights or windshield wipers. If they won't run, the battery is discharge. Automatic transmission not engaged In park (PI or Neutral (N). Broken, loose or disconnected wires In the staging circuit. Inspect all wires and connectors at the battery, starter solenoid and ignition switch (on steering column). Starter motor pinion jammed in flywheel ring gear. II manual transmission, place transmission In gear and rack the vehicle to manually turn the engine. Remove starter and Inspect pinion and flywheel. Starter solenoid faulty. Starter motor faulty. Ignition switch tautly. Engine seized. Try lo turn to crankshaft with a large socket and breaker bar on the pulley bolt. credit: https://www.wc-autoparts.com/blog/trouble-shooting-no-start-condition-19932002-camaro-and-firebird/
... A faulty coolant sensor that always reads cold may cause the fuel control system to run rich, it may be sending the wrong info to the computer and the guage. make sure there is no air in the coolant system, and it is full. see if coolant resorvoir is full when hot. if all is ok, change coolant sensor. good-day!
If you are sure that it is antifreeze and reservoir is full, start up your car and put it on car ramps or a rack and find the location of the leak. You can run the car until temp gauge registers mid-temp especially in cold weather. A fan blowing on the motor will help cool engine. Good luck finding the leak.
Yes. When left in the convertible position the top seems to shrink a little. Have someone to push the top up button while you pull down on the top and try to latch one side. Passenger side usually works for me. After that you can latch the driver side. The less you leave the top in the boot the better.