You can save up for when you are ready to upgrade. There's no reason now to pull the plenum and all the injectors on a student's budget. Being in school is no time to start throwing money at this car. They will all slowly fail but you may have another year or two in the ones that are still in there. Use the dremel method to get the one injector out and call up Bernie to send you a tested used injector. Replace and be on your merry way until you have the cash to start doing thoughtful upgrades.