Skipping Hummer h2

[cathyiam]

Hey. Thanks for the advice. We have noticed over the past 2 days that if it starts doing it-it does it like I said mosly of the morning,but it starts when we hit 55 mph-it will do it constantly if you stay @ 55, but when you go over 55 it stops. the rpms jump the whole time it is doing it. We will check the key ring,but it doesn't die all together-it just skips like it's running out of fuel. It has been doing it for at least 5 months and has not got worse. We have had it to the Chevy place because the nearest hummer place is over 100 miles away- they changed the rear diff fluid and the fuel filter,but did not know what else to do. I will try wetting the coils and spark plugs. Another mechanic told us to crank it @ night and see if a spark jumped off the coil, but no luck.