Connorruss

Hi there thank you for taking you time to help a guy out i have a Audi A4 2.0l fsi 2003 I bought it three weeks ago with a Missfire and power loss when accelerating problem thinking it could be spark plugs and coil packs so I changed them full service etc still the same problem so I'll talk you trough every little detail the car starts up sounds rough and vibrates feels like it wants to cut out when it gets going seems fine for a Minuit or so then you go to accelerate it goes no where like something is pulling it back and engine manigement light flicks on and off when it gets warm and traveling a distance it's fine pulls in every gear etc second you come to a set of traffic light the same problem when you go to set off any tips on what to do would be greatly appreciated thank you for reading peace