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Weird rpms?

698 Views 7 Replies 3 Participants Last post by  TimTom64b
So I have this strange thing happening with my motor I will be sitting at a stop foot on the brake and my rpms will jump from a 500 idle to about 1200 just for a second then come back down. I don't get it has anyone else experienced this?
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It's a 95 K1500 5.7 TBI with 233, xxx miles. No mods except for a k&n filter and 4 inch cat back diesel pipe. Changed plugs a couple months ago and oil changed every 3k
Ok I will look into that thank you for the help
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