my 1999 gmc sierra wont start when it gets hot. I have to wait about an hour for it to cool down and then it will start. I've been told that it is an electrical problem. I changed the cap and rotor, spark plugs, and cables thinking that would solve it but that didnt. please tell me what i need to change for it to stop doing that?
If this is the 4.3L engine, sure sounds like the ignition control module. When they start to go bad the engine heat will affect them. You could take it out and have it tested at an auto parts store. You may as well bring in the coil to be tested also.
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