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Check for bad spark plug cables and check all the plugs. Take out spark plug cable one by one and crank engine to check if there is spark or not. Before you head over replacing expensive items in this car get a compression check by mechanic for each cylinder. For a car this old and so much miles on it, most probably it needs an engine rebuild.
Tyhe first thing you shd always do on any car with starting problems is to check the spark on the plugs to localize the problem to either fuel or ignition problem. If u have an old spark plug lying around, remove one spark plug wire and attach it to the plug and lay it against the block. If it fires, when the engine turns, then it will most likely be fuel problem.
If it turns out to be fuel problem, you can prove it by using starting fluid carefully into the breather area.
An engine can be destroyed even after overheating once. If there's steam coming from around the spark plug the head and or block is warped, at very least the head gasket has been destroyed. Take the car to a repair shop immediately, but I'm afraid the damage I'd already done.
Autozone and similar stores will check the codes in the computer for free usually. That is the best place to start. Other possibilities are Engine Coolant Temperature sensor (saying the engine is cold when it's not) or excessive fuel pressure (bad regulator or blocked return line)
hesitation under excell can be spark related. check your spark plugs. they may be worn, with exsessive gap.
I always recomend AC delco plugs for GM engines. stay away from Bosch plugs.
Another thing to consider is fuel quality.
Try a different brand.
I have had lots of problems with Arco fuel.
i believe that your distributor points are getting wet form hummidity and you timming may also be off or you may have the wrong plugs but im sure its not starting when damp because of somthing under the distributor cap
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