What to check next?
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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