hi everyone, i have a 1997 audi a4 1.8t quattro, when i try and start it it turns over fine but it wont fire up for like 7 seconds but once it fires up it runs a bit rough for like 2 seconds then it runs perfect. If i let it run for awhile and then turn it off and turn it on right away again it fires up instantly with no problems at all, any help would be greatly appreciated!

Thank you