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is my truck missfiring? is it out of timing? 1991 gmc jimmy 4.3 liter 6 cyl (video)?

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Stan

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and what is that high pitched humming noise makes it sound like its runs on alcohol?

http://www.youtube.com/watch?v=cH_B5tRfMx4
 
sorry, but the sound in that video was really bad, i couldn't even tell what i was hearing apart from your voice. Whenever it is misfiring it usually just needs a tune-up (timing if it has a distributor which i think i saw in yours, spark plugs, plug wires) in your case you might just need to time it up.
 

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