What to check next?

Asked by Jul 10, 2017 at 04:23 PM about the 2007 Hummer H3 4 Dr H3X

Question type: General

My hummer idles fine but going down the road the rpms go up and it surges.
Rpms go way up and finally shifts but doesn't act like it wants to usually when
it's warm it does it less. I have no codes and the engine light is not on. This
was before I changed the spark plugs. After I changed them it ran great for a
day or so now it's doing it again. Any ideas?  I also put a bottle of Lucas in
the fuel tank. Thanks

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