About 3 months ago my car started missing on me and therefore it turned on the check engine light. i had my friend take a look at it and it was a bad injector i cleared the problem up and the car runs great. except the fact that now when start it, it must miss at startup because now my check engine light always comes on at startup and it also takes my car longer to start than normal. i have been ignoring it but now its starting to annoy me. the car runs great once it is started...and also it never has problems getting started and it runs great once it does...any ideas?

ps it has had the distrib cap rotor and plugs and wires done already

97 LS