No, I don't think you'd want to burn hydrogen sulfide gas. Hydrogen molecules would combine with oxygen in the combustion process giving you the power to move your pistons and propel your vehicle alright. However, the byproducts would be water (no big deal) and sulfur (bigger deal)! Some of the sulfur would combine with water vapor to create either sulfuric or sulfurous acid. Both are very bad for you to breath (for any length of time, deadly). They also will eat through many engine and exhaust parts made out of metal.
I think there are other gases we should take a closer look at using though. Hydrogen from electrolysis might be a possibility in some cases. I saw a story once about an old farmer in Iowa who built his own electrolysis machine powered by a small wind machine, compressed the hydrogen and stored it in pressure tanks. He ran his tractors and a truck I think off of it that he'd put conversion kits on. Interesting anyway.
Also, how about if these big hog, chicken, turkey and cattle operations putting the waste into digesters to create a type of natural gas to sell or use for a variety of energy applications? The technology is not very complicated from what I've read in either Popular Science or Mechanics. It's used in a number of less developed countries on small scale even to use for heating and cooking.
If the higher prices get some inventive minds working overtime and make other renewable sources more economical, they may be a blessing in disguise!