92 audi 100 2.8 auto engine cuts out after gear change
 

hi my engine dies for a few seconds after changing gear e.g from standstill i have about half throttle and when it changes to second the motor dies for a few seconds then slowly comes back to life. doesnt do it at full throttle. has also done it at 100kmh when passing another car when it changed to 4th it died then it slowly comes back to life or if i floor it it goes.
seems to do it mostly at half throttle. theres a hill i regularly go up at 45kmh and at beginning of hill it dies for a second then holding throttle consant the revs fluctuate like 2000 then 1800 then 2000 then 1800 at a regular interval
any help plzzz!