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Have a 1999 chevy 1500 Z71 (v8). I was listing to the radio the other night for about 3hrs and went out the next morning and it won't start. Changed the battery and all it does when I turn the key is EVERYTHING turns off while the key is in the crank possition. Once you place in run possition everything comes back on (radio,lights,gauges,etc). also check all kinds of fuses but all looked ok. ????
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Depending on where you are checking the spark, orange may be rather weak. It should be white or blue. If the plugs are dry and they have an orange spark, the coil may be going dead.
If the engine is turning over than none of the things you replaced will make the engine"start".
You will need to check for fuel pressure and spark first.
i had alot of wiring problems with my 99 silverado. I lost my tail lights completly and had to replace my fuel pump wire harness just for a few examples. My suggestion is to start looking for any loose grounds and broken or cracked wires
How many miles do you have on it? Might be time for a tune-up (new plugs, plug wires, etc.) Start with the simple things first - have you changed your fuel filter? Could also be bad gas - couple of bottles of Heet (alcohol) will help with this. Then move on to more things like a Vacuum leak, fuel pump.
It costs nothing to try this; check for cracked or disconnected vacuum lines. This is monitored to initiate shifting up. If the vacuum is low the transmission doesn't know when it is OK to shift.
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