Hi, everyone. I decided to register to get help for my girlfriend. She drives a 99 4wd auto. She has been having problems with stalling on start up. It usually occurs right after the engine has been turned off and then turned on after a brief momment. For example, it always happens after filling up. I was wondering if anyone else has experienced this. Could this be a problem with fuel (fuel pump) or maybe a sparkplug / wire issue. What kind of plugs come stock and how long do they last. Sorry for these general type of questions, I tried to search nothing that seems to answer my questions definately. Any help would be appreciated.