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Q: erratic starting and engine stalling on 2004 Chevrolet Silverado 1500

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First start of the day my pickup fires right up hot or cold. Drive to the store and when I return it won't start then after several cranks it starts, no codes, gauges all reading right. Now this week it has stalled when I was driving on the freeway at say 60mph, 2 times the a/c wasn't on and the last time it stalled as soon as I turned the a/c on, shift to neutral and usually about 3 cranks later it starts. New battery, no alternator problems, new wires and plugs, k-n air & oil filter. Any ideas anybody?
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Check for base fuel pressure and pressure bleed down. When the problem occurs, check for the presence of fuel and spark. One will be missing. This will help direct the diagnosis.

If you have both fuel and spark and you still don't start, the air intake system may be contributing to your issue. A contaminated Mass Air Flow sensor (somewhat common with a K&N filter, etc) can cause some issues for you, especially when the engine is warmer.
Thank you so much. I will give your suggestions a try. Do you recommend that I stop using the K&N Filter?
Not necessarily. Just be careful oiling it. The oil gets onto the sensor and can contaminate it. Not saying it did, just that it can...
Okay, I'm still having the same problems only worse. Now pretty much everytime I go to start the pickup it won't start but does turn over. Today I got stranded and a man came a sprayed starting fluid into the intake manifold, 2 sprays and try to crank after doing this about 4 times it fires right up without hesitation. It will keep running or idling unless I turn on the a/c. What could the revelance be between these things? I know the starting fluid is not good for the engine but didn't know what else to do. I'm single and just can't afford to take it to the shop.
I am having the same problem. for awhile it would run fine then when I turned it off it didn't want to start. yesterday it got to the place it wouldn't start at all. I took off the distributer cap and it is terrible. corroded and so is the rotor. I have them on order and will put them on tomorrow. hope this fixes it
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