car sputter, or vibrates and smell of fuel

You need to start by checking for any live fuel leaks. Could be a rusted line, a bad fuel pressure regulator, etc. That is most important as that can be dangerous. Find a leak and that will likely fix your issue. If there is no leak then you may have a really bad misfire. You need to make sure each cylinder is getting spark, if so then this could be an injector issue. Try pulling the plug on each injector one at a time with the engine running to isolate a possible misfire. If you can't figure it out then use this link to find a good shop near you. Alex

Have fuel injector o-ring seals checked for leakage.