For a car that’s over 20 years in age, I would say bulbs need replaced. For the dash though, check the “bright/dim” adjust for the dash lights to make sure it wasn’t turned to the off position.
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More than likely a freeze plug.Get the vehicle running and when the cooling fans come on(with ac and defrost off) turn motor off and look for leak under vehicle,this will help you locate the leak a lot better.
Could be any number of different thing's . Have thrity years as automotive technician . Started in 1984 at first GM dealership - chevy . Dirty throttle plate , IAC air passages- probably not - wouldn't do it one time then not the next . TPS - throttle postion sensor - maybe .Sticking EGR valve Taking your vehicle to a qualified repair shop that has the proper diagnostic equipment an knowledge . Testing an not guessing is the way to a proper fix.
007 Idle Speed Problems Scan Data for Idle
Sounds like you have trash/debris in the vents or your A/C evaporator is clogged with dirt.
Clean everything out and it should be okay. While doing that check for loose parts like flapper doors etc.
A vacuum cleaner with a flex rubber snouts helps.
Try the throttle position sensor, or the idle air control valve. If crank sensor is bad it won't start at all. Does it have the check engine light on? What are the codes???
If you have spark at all the plugs, the crank sensor should be ok. You should use a gage to check fuel pressure? I don't know engine size? For the 3.1L engine, my info says 40--46 psi.
It is possible to have spark at the plugs, but, the computer doesn't see rpm signal. If that is the case, no fuel injector pulse. The purple wire with white tracer carries rpm signal from ignition module to pcm, that wire has dc pulse, engine cranking. If nothing there, have to check ignition module.
How long since a tune-up? Any applicable trouble codes?
Check and make sure the rear axle bearing are good. One maybe going bad also check the universal joint on the drive shaft to make sure there is no wear there as well. Hope this helps.
Sorry I can't be much practical help but I would like to point out you are unlikely to make any progress even if you knew what those wires did.
A wiring diagram is little help if you don't know how something works. If you don't know how it works the chances of discovering why it doesn't work would be almost pure luck. Sensors must be tested, wiring checked for continuity, supplies and grounds tested and all that is best done in a fairly logical systematic manner until everything is found to be serviceable and if it still doesn't spark the process of elimination has left just the module, amplifier or ECU as applicable as the probable culprit.
As a computer geek I am guessing you know your way around a multimeter so you could do some of it but really there is no substitute for core knowledge and experience.
In short, it would probably be best to do whatever it takes to take the car to a repair shop. I think you need to surround yourself with a circle of friends who can do the things you can't, friends who are easily bribed into action...
Call a Chevy dealership, ask for the service department, and ask them the question.
Other independent repair garages also have this information.
Please do not be surprised if it takes you several phone calls to find someone interested to tell you the answer.
God bless your efforts.
