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Chevy Astro Misfire

Sometimes my Chevy Astro misses and sometimes not seems worse when it is damp or real cold. Any Ideas? It idles fine only when under a load will it miss. Thanx
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Comments
If you can, spray some water in your van's engine compartment (at night time for best visual results) and see what happens. An "old school" testing trick that many mechanics still use today....
The BULL about using a GM part is just that BULL!
Enjoy!
Replaced it and all the problems went away.
I am not kidding that was the problem.
if your turn signal is acting up I would look at this as the problem.
My van has run without any problems now for a year now.
Who would have thought that this would cause the problem.